The United States of America (commonly called the United States, the U.S., the USA, America, and the States) is a federal constitutional republic consisting of fifty states and a federal district. The country is situated mostly in central North America, where its forty-eight contiguous states and Washington, D.C., the capital district, lie between the Pacific and Atlantic Oceans, bordered by Canada to the north and Mexico to the south. The state of Alaska is in the northwest of the continent, with Canada to the east and Russia to the west across the Bering Strait. The state of Hawaii is an archipelago in the mid-Pacific. The country also possesses several territories in the Pacific and Caribbean. At 3.79 million square miles (9.83 million km2) and with over 314 million people, the United States is the third- or fourth-largest country by total area, and the third-largest by both land area and population. It is one of the world's most ethnically diverse and multicultural nations, the product of large-scale immigration from many countries.
Etymology
The first documentary evidence of the phrase "United States of America" was in an anonymously written essay published in the Virginia Gazette newspaper in Williamsburg, Virginia on April 6, 1776. In June 1776, Thomas Jefferson included the phrase "UNITED STATES OF AMERICA" in all capitalized letters in the headline of his “original Rough draught” of the Declaration of Independence. In the final Fourth of July version of the Declaration, the pertinent section of the title was changed to read, "The unanimous Declaration of the thirteen united States of America".
On November 15, 1777, the Second Continental Congress adopted the Articles of Confederation, which states, "The Stile of this Confederacy shall be 'The United States of America'." The Franco-American treaties of 1778 used "United States of North America", but from July 11, 1778, "United States of America" was used on the country's bills of exchange, and it has been the official name ever since.
The short form "United States" is also standard. Other common forms include the "U.S.", the "USA", and "America". Colloquial names include the "U.S. of A." and, internationally, the "States". "Columbia", a name popular in poetry and songs of the late 1700s, derives its origin from Christopher Columbus; it appears in the name "District of Columbia".
The standard way to refer to a citizen of the United States is as an "American". Although "United States" is the official appositional term, "American" and "U.S." are more commonly used to refer to the country adjectivally ("American values", "U.S. forces"). "American" is rarely used in English to refer to subjects not connected with the United States.
The phrase "United States" was originally treated as plural—e.g., "the United States are"—including in the Thirteenth Amendment to the United States Constitution, ratified in 1865. It became common to treat it as singular—e.g., "the United States is"—after the end of the Civil War. The singular form is now standard; the plural form is retained in the idiom "these United States".
History
Native American and European settlement
The indigenous peoples of the U.S. mainland, including Alaska Natives, are believed to have migrated from Asia, beginning between 40,000 and 12,000 years ago. Some, such as the pre-Columbian Mississippian culture, developed advanced agriculture, grand architecture, and state-level societies. After Europeans began settling the Americas, many millions of indigenous Americans died from epidemics of imported diseases such as smallpox. The whole of what is today described as the "U.S. mainland" was once the land of the indigenous peoples.
In 1492 while under contract to Spanish crown, Christopher Columbus discovered several Caribbean islands and made first contact with the indigenous people. On April 2, 1513, Spanish conquistador Juan Ponce de León landed on what he called "La Florida" - the first documented European arrival on what would become the U.S. mainland. Spanish settlements in the region were followed by ones in the present-day southwestern United States. French fur traders established outposts of New France around the Great Lakes; France eventually claimed much of the North American interior, down to the Gulf of Mexico.
The Mayflower transported Pilgrims to New England in 1620. The Mayflower Compact placed London ex-cons and Separatist men on an equal footing in the new land.
The first successful English settlements were the Virginia Colony in Jamestown in 1607 and the Pilgrims' Plymouth Colony in 1620. The 1628 chartering of the Massachusetts Bay Colony resulted in a wave of migration; by 1634, New England had been settled by some 10,000 Puritans. Between the late 1610s and the American Revolution, about 50,000 convicts were shipped to Britain's American colonies. Beginning in 1614, the Dutch settled along the lower Hudson River, including New Amsterdam on Manhattan Island.
In 1674, the Dutch ceded their American territory to England; the province of New Netherland was renamed New York. Many new immigrants, especially to the South, were indentured servants—some two-thirds of all Virginia immigrants between 1630 and 1680. By the turn of the 18th century, African slaves were becoming the primary source of bonded labor in many regions.
With the 1729 division of the Carolinas and the 1732 colonization of Georgia, the thirteen British colonies that would become the United States of America were established. All had local governments with elections open to most free men, with a growing devotion to the ancient rights of Englishmen and a sense of self-government stimulating support for republicanism. All legalized the African slave trade. With high birth rates, low death rates, and steady immigration, the colonial population grew rapidly. The Christian revivalist movement of the 1730s and 1740s known as the Great Awakening fueled interest in both religion and religious liberty.
In the French and Indian War, British forces seized Canada from the French, but the francophone population remained politically isolated from the southern colonies. Excluding the Native Americans, who were being displaced, those thirteen colonies had a population of 2.6 million in 1770, about one-third that of Britain; nearly one in five Americans were black slaves. Though subject to British taxation, the American colonials had no representation in the Parliament of Great Britain.
Independence and expansion
Tensions between American colonials and the British during the revolutionary period of the 1760s and early 1770s led to the American Revolutionary War, fought from 1775 to 1781. On June 14, 1775, the Continental Congress, convening in Philadelphia, established a Continental Army under the command of George Washington. Proclaiming that "all men are created equal" and endowed with "certain unalienable Rights", the Congress adopted the Declaration of Independence, drafted largely by Thomas Jefferson, on July 4, 1776. That date is now celebrated annually as America's Independence Day. In 1777, the Articles of Confederation established a weak confederal government that operated until 1789. 
After the British defeat by American forces assisted by the French and Spanish, Great Britain recognized the independence of the United States and the states' sovereignty over American territory west to the Mississippi River.[39] Those wishing to establish a strong federal government with powers of taxation organized a constitutional convention in 1787.[40] The United States Constitution was ratified in 1788, and the new republic's first Senate, House of Representatives, and president—George Washington—took office in 1789. The Bill of Rights, forbidding federal restriction of personal freedoms and guaranteeing a range of legal protections, was adopted in 1791.
Attitudes toward slavery were shifting; a clause in the Constitution protected the Atlantic slave trade only until 1808. The Northern states abolished slavery between 1780 and 1804, leaving the slave states of the South as defenders of the "peculiar institution". The Second Great Awakening, beginning about 1800, made evangelicalism a force behind various social reform movements, including abolitionism.
Americans' eagerness to expand westward prompted a long series of Indian Wars. The Louisiana Purchase of French-claimed territory under President Thomas Jefferson in 1803 almost doubled the nation's size. The War of 1812, declared against Britain over various grievances and fought to a draw, strengthened U.S. nationalism.
The California Gold Rush of 1848–49 further spurred western migration. New railways made relocation easier for settlers and increased conflicts with Native Americans. Over a half-century, up to 40 million American bison, or buffalo, were slaughtered for skins and meat and to ease the railways' spread. The loss of the buffalo, a primary resource for the plains Indians, was an existential blow to many native cultures.
Civil War and industrialization
Tensions between slave and free states mounted with arguments about the relationship between the state and federal governments, as well as violent conflicts over the spread of slavery into new states. Abraham Lincoln, candidate of the largely antislavery Republican Party, was elected president in 1860. Before he took office, seven slave states declared their secession—which the federal government maintained was illegal—and formed the Confederate States of America. 
After the war, the assassination of Abraham Lincoln radicalized Republican Reconstruction policies aimed at reintegrating and rebuilding the Southern states while ensuring the rights of the newly freed slaves. The resolution of the disputed 1876 presidential election by the Compromise of 1877 ended Reconstruction; Jim Crow laws soon disenfranchised many African Americans.
In the North, urbanization and an unprecedented influx of immigrants from Southern and Eastern Europe hastened the country's industrialization. The wave of immigration, lasting until 1929, provided labor and transformed American culture. National infrastructure development spurred economic growth.
The 1867 Alaska Purchase from Russia completed the country's mainland expansion. The Wounded Knee Massacre in 1890 was the last major armed conflict of the Indian Wars. In 1893, the indigenous monarchy of the Pacific Kingdom of Hawaii was overthrown in a coup led by American residents; the United States annexed the archipelago in 1898. Victory in the Spanish–American War the same year demonstrated that the United States was a world power and led to the annexation of Puerto Rico, Guam, and the Philippines. The Philippines gained independence a half-century later; Puerto Rico and Guam remain U.S. territories.
World War I, Great Depression, and World War II
At the outbreak of World War I in 1914, the United States remained neutral. Most Americans sympathized with the British and French, although many opposed intervention.[64] In 1917, the United States joined the Allies, and the American Expeditionary Forces helped to turn the tide against the Central Powers. After the war, the Senate did not ratify the Treaty of Versailles, which established the League of Nations.
The country pursued a policy of unilateralism, verging on isolationism. In 1920, the women's rights movement won passage of a constitutional amendment granting women's suffrage. The prosperity of the Roaring Twenties ended with the Wall Street Crash of 1929 that triggered the Great Depression. After his election as president in 1932, Franklin D. Roosevelt responded with the New Deal, a range of policies increasing government intervention in the economy, including the establishment of the Social Security system. The Dust Bowl of the mid-1930s impoverished many farming communities and spurred a new wave of western migration.
The United States, effectively neutral during World War II's early stages after Nazi Germany's invasion of Poland in September 1939, began supplying materiel to the Allies in March 1941 through the Lend-Lease program. On December 7, 1941, the Empire of Japan launched a surprise attack on Pearl Harbor, prompting the United States to join the Allies against the Axis powers as well as the internment of Japanese Americans by the thousands. Participation in the war spurred capital investment and industrial capacity. Among the major combatants, the United States was the only nation to become richer—indeed, far richer—instead of poorer because of the war.
Yalta Conference
Allied conferences at Bretton Woods and Yalta outlined a new system of international organizations that placed the United States and Soviet Union at the center of world affairs. As victory was won in Europe, a 1945 international conference held in San Francisco produced the United Nations Charter, which became active after the war. The United States, having developed the first nuclear weapons, used them on the Japanese cities of Hiroshima and Nagasaki in August. Japan surrendered on September 2, ending the war.
Cold War and protest politics
The United States and the Soviet Union jockeyed for power after World War II during the Cold War, dominating the military affairs of Europe through NATO and the Warsaw Pact, respectively. While they engaged in proxy wars and developed powerful nuclear arsenals, the two countries avoided direct military conflict. The U.S. often opposed Third World left-wing movements that it viewed as Soviet-sponsored. American troops fought Communist Chinese and North Korean forces in the Korean War of 1950–53. The House Un-American Activities Committee pursued a series of investigations into suspected leftist subversion, while Senator Joseph McCarthy became the figurehead of anticommunist sentiment.
The 1961 Soviet launch of the first manned spaceflight prompted President John F. Kennedy's call for the United States to be first to land "a man on the moon", achieved in 1969. Kennedy also faced a tense nuclear showdown with Soviet forces in Cuba. Meanwhile, the United States experienced sustained economic expansion. A growing civil rights movement, symbolized and led by African Americans such as Rosa Parks and Martin Luther King, Jr., used nonviolence to confront segregation and discrimination.
Martin Luther King, Jr. delivering his "I Have a Dream" speech, 1963.
Following Kennedy's assassination in 1963, the Civil Rights Act of 1964 and Voting Rights Act of 1965 were passed under President Lyndon B. Johnson. He also signed into law the Medicare and Medicaid programs. Johnson and his successor, Richard Nixon, expanded a proxy war in Southeast Asia into the unsuccessful Vietnam War. A widespread countercultural movement grew, fueled by opposition to the war, black nationalism, and the sexual revolution. Betty Friedan, Gloria Steinem, and others led a new wave of feminism that sought political, social, and economic equality for women.
As a result of the Watergate scandal, in 1974 Nixon became the first U.S. president to resign, to avoid being impeached on charges including obstruction of justice and abuse of power. The Jimmy Carter administration of the late 1970s was marked by stagflation and the Iran hostage crisis. The election of Ronald Reagan as president in 1980 heralded a rightward shift in American politics, reflected in major changes in taxation and spending priorities. His second term in office brought both the Iran-Contra scandal and significant diplomatic progress with the Soviet Union. The subsequent Soviet collapse ended the Cold War.
Contemporary era
Under President George H. W. Bush, the United States took a lead role in the UN–sanctioned Gulf War. The longest economic expansion in modern U.S. history—from March 1991 to March 2001—encompassed the Bill Clinton administration and the dot-com bubble. A civil lawsuit and sex scandal led to Clinton's impeachment in 1998, but he remained in office. The 2000 presidential election, one of the closest in American history, was resolved by a U.S. Supreme Court decision—George W. Bush, son of George H. W. Bush, became president.
On September 11, 2001, al-Qaeda terrorists struck the World Trade Center in New York City and The Pentagon near Washington, D.C., killing nearly three thousand people. In response, the Bush administration launched the global War on Terror, invading Afghanistan and removing the Taliban government and al-Qaeda training camps. Taliban insurgents continue to fight a guerrilla war. In 2002, the Bush administration began to press for regime change in Iraq on controversial grounds.
Forces led by the U.S. invaded Iraq in 2003, ousting Saddam Hussein. In 2005, Hurricane Katrina caused severe destruction along much of the Gulf Coast, devastating New Orleans. 
Government and politics
The United States is the world's oldest surviving federation. It is a constitutional republic and representative democracy, "in which majority rule is tempered by minority rights protected by law". The government is regulated by a system of checks and balances defined by the U.S. Constitution, which serves as the country's supreme legal document.
In the American federalist system, citizens are usually subject to three levels of government, federal, state, and local; the local government's duties are commonly split between county and municipal governments. In almost all cases, executive and legislative officials are elected by a plurality vote of citizens by district. There is no proportional representation at the federal level, and it is very rare at lower levels.
The federal government is composed of three branches:
Legislative: The bicameral Congress, made up of the Senate and the House of Representatives, makes federal law, declares war, approves treaties, has the power of the purse,[79] and has the power of impeachment, by which it can remove sitting members of the government.
Executive: The president is the commander-in-chief of the military, can veto legislative bills before they become law (subject to Congressional override), and appoints the members of the Cabinet (subject to Senate approval) and other officers, who administer and enforce federal laws and policies.
Judicial: The Supreme Court and lower federal courts, whose judges are appointed by the president with Senate approval, interpret laws and overturn those they find unconstitutional.
The House of Representatives has 435 voting members, each representing a congressional district for a two-year term. House seats are apportioned among the states by population every tenth year. As of the 2000 census, seven states have the minimum of one representative, while California, the most populous state, has fifty-three.
The Senate has 100 members with each state having two senators, elected at-large to six-year terms; one third of Senate seats are up for election every other year. The president serves a four-year term and may be elected to the office no more than twice. The president is not elected by direct vote, but by an indirect electoral college system in which the determining votes are apportioned to the states and the District of Columbia. The Supreme Court, led by the Chief Justice of the United States, has nine members, who serve for life.
The state governments are structured in roughly similar fashion; Nebraska uniquely has a unicameral legislature. The governor (chief executive) of each state is directly elected. Some state judges and cabinet officers are appointed by the governors of the respective states, while others are elected by popular vote.
The original text of the Constitution establishes the structure and responsibilities of the federal government and its relationship with the individual states. Article One protects the right to the "great writ" of habeas corpus, and Article Three guarantees the right to a jury trial in all criminal cases. Amendments to the Constitution require the approval of three-fourths of the states. The Constitution has been amended twenty-seven times; the first ten amendments, which make up the Bill of Rights, and the Fourteenth Amendment form the central basis of Americans' individual rights. All laws and governmental procedures are subject to judicial review and any law ruled in violation of the Constitution is voided. The principle of judicial review, not explicitly mentioned in the Constitution, was declared by the Supreme Court in Marbury v. Madison (1803).
Economy
The United States is the largest importer of goods and third largest exporter, though exports per capita are relatively low. In 2010, the total U.S. trade deficit was $635 billion. Canada, China, Mexico, Japan, and Germany are its top trading partners. In 2010, oil was the largest import commodity, while transportation equipment was the country's largest export. China is the largest foreign holder of U.S. public debt. Chemical products are the leading manufacturing field. The United States is the third largest producer of oil in the world, as well as its largest importer. It is the world's number one producer of electrical and nuclear energy, as well as liquid natural gas, sulfur, phosphates, and salt. While agriculture accounts for just under 1% of GDP, the United States is the world's top producer of corn and soybeans. Coca-Cola and McDonald's are the two most recognized brands in the world.
The 2008-2012 global recession effected the United States quite badly. For example, persistent high unemployment remains, along with low consumer confidence, the continuing decline in home values and increase in foreclosures and personal bankruptcies, an escalating federal debt crisis, inflation, and rising petroleum and food prices. In fact, a 2011 poll found that more than half of all Americans think the U.S. is still in recession or even depression, despite official data that shows a historically modest recovery. In 2009, the United States had the third highest labor productivity per person in the world, behind Luxembourg and Norway. It was fourth in productivity per hour, behind those two countries and the Netherlands. Compared to Europe, U.S. property and corporate income tax rates are generally higher, while labor and, particularly, consumption tax rates are lower.
Geography and environment
The land area of the contiguous United States is 2,959,064 square miles (7,663,941 km2). Alaska, separated from the contiguous United States by Canada, is the largest state at 663,268 square miles (1,717,856 km2). Hawaii, occupying an archipelago in the central Pacific, southwest of North America, is 10,931 square miles (28,311 km2) in area.
The United States is the world's third or fourth largest nation by total area (land and water), ranking behind Russia and Canada and just above or below China. The ranking varies depending on how two territories disputed by China and India are counted and how the total size of the United States is measured: calculations range from 3,676,486 square miles (9,522,055 km2) to 3,717,813 square miles (9,629,091 km2) to 3,794,101 square miles (9,826,676 km2). Measured by only land area, the United States is third in size behind Russia and China, just ahead of Canada.
The Rocky Mountains, at the western edge of the Great Plains, extend north to south across the country, reaching altitudes higher than 14,000 feet (4,300 m) in Colorado. Farther west are the rocky Great Basin and deserts such as the Chihuahua and Mojave. The Sierra Nevada and Cascade mountain ranges run close to the Pacific coast, both ranges reaching altitudes higher than 14,000 feet.
The lowest and highest points in the continental United States are in the state of California, and only about 80 miles apart. At 20,320 feet (6,194 m), Alaska's Mount McKinley is the tallest peak in the country and in North America. Active volcanoes are common throughout Alaska's Alexander and Aleutian Islands, and Hawaii consists of volcanic islands. The supervolcano underlying Yellowstone National Park in the Rockies is the continent's largest volcanic feature.
The United States, with its large size and geographic variety, includes most climate types. To the east of the 100th meridian, the climate ranges from humid continental in the north to humid subtropical in the south. The southern tip of Florida is tropical, as is Hawaii. The Great Plains west of the 100th meridian are semi-arid. Much of the Western mountains are alpine. The climate is arid in the Great Basin, desert in the Southwest, Mediterranean in coastal California, and oceanic in coastal Oregon and Washington and southern Alaska. Most of Alaska is subarctic or polar. Extreme weather is not uncommon—the states bordering the Gulf of Mexico are prone to hurricanes, and most of the world's tornadoes occur within the country, mainly in the Midwest's Tornado Alley.
The Endangered Species Act of 1973 protects threatened and endangered species and their habitats, which are monitored by the United States Fish and Wildlife Service. There are fifty-eight national parks and hundreds of other federally managed parks, forests, and wilderness areas. Altogether, the government owns 28.8% of the country's land area. Most of this is protected, though some is leased for oil and gas drilling, mining, logging, or cattle ranching; 2.4% is used for military purposes.
Education
Education in the United States is mainly provided by the public sector, with control and funding coming from three levels: local, state, and federal, in that order. Child education is compulsory. There are also a large number and wide variety of higher education institutions throughout the country that one can choose to attend, both publicly and privately administered.
Public education is universally available. School curricula, funding, teaching, employment, and other policies are set through locally elected school boards with jurisdiction over school districts with many directives from state legislatures. School districts are usually separate from other local jurisdictions, with independent officials and budgets. Educational standards and standardized testing decisions are usually made by state governments.
The ages for compulsory education vary by state. It begins from ages five to eight and ends from ages fourteen to eighteen.[4] Compulsory education requirements can generally be satisfied by educating children in public schools, state-certified private schools, or an approved home school program. In most public and private schools, education is divided into three levels: elementary school, middle school (sometimes called junior high school), and high school (sometimes referred to as secondary education).
In almost all schools at these levels, children are divided by age groups into grades, ranging from kindergarten (followed by first grade) for the youngest children in elementary school, up to twelfth grade, the final year of high school. The exact age range of students in these grade levels varies slightly from area to area.
Post-secondary education, better known as "college" in the United States, is generally governed separately from the elementary and high school system, and is described in a separate section below.
School grades
Most children enter the public education system around ages five or six. The American school year traditionally begins at the end of August or the day after Labor Day in September, after the traditional summer recess. Children are assigned into year groups known as grades, beginning with preschool, followed by kindergarten and culminating in twelfth grade. Children customarily advance together from one grade to the next as a single cohort or "class" upon reaching the end of each school year in late May or early June.
The American educational system comprises 12 grades of study over 12 calendar years of primary and secondary education before graduating, and often becoming eligible for admission to higher education.[15] After pre-kindergarten and kindergarten, there are five years in primary school (normally known as elementary school). After completing five grades, the student will enter junior high or middle school and then high school to get the high school diploma.
The U.S. uses ordinal numbers (e.g., first grade) for identifying grades. Typical ages and grade groupings in public and private schools may be found through the U.S. Department of Education. Many different variations exist across the country.
Students completing high school may choose to attend a college or university. Undergraduate degrees may be either associate's degrees or bachelor's degrees (baccalaureate).
Community college typically offer two-year associate's degrees, although some community colleges offer a limited number of bachelor's degrees. Some community college students choose to transfer to a four-year institution to pursue a bachelor's degree. Community colleges are generally publicly funded and offer career certifications and part-time programs. Four-year institutions may be public or private colleges or universities.
Most public institutions are state universities, which are sponsored by state governments and typically receive funding through some combination of taxpayer funds, tuition, private donations, federal grants, and proceeds from endowments. State universities are organized in a wide variety of ways, and many are part of a state university system. However, not all public institutions are state universities. The five service academies, one for each branch of the armed forces, are completely funded by the federal government; the academies train students (cadets or midshipmen) to be commissioned officers in exchange for a mandatory term of military service. Additionally, some local governments (counties and cities) have four-year institutions of their own - one example is the City University of New York.
Private institutions are privately funded and there is wide variety in size, focus, and operation. Some private institutions are large research universities, while others are small liberal arts colleges that concentrate on undergraduate education. Some private universities are nonsectarian while others are religiously affiliated. While most private institutions are non-profit, a number are for profit.
Curriculum varies widely depending on the institution. Typically, an undergraduate student will be able to select an academic major or concentration, which comprises the main or special subjects, and students may change their major one or more times.
Some students, typically those with a bachelor's degree, may chose to continue on to graduate or professional school. Graduate degrees may be either master's degrees (e.g., M.S., M.B.A., M.S.W.) or doctorates (e.g., Ph.D., J.D., M.D.). Academia-focused graduate school typically includes some combination of coursework and research (often requiring a thesis or dissertation), while professional school (e.g., medical, law, business) grants a first professional degree and aims to prepare students to enter a learned profession.
Home schooling
In 2007, approximately 1.5 million children were homeschooled, up 74% from 1999 when the U.S. Department of Education first started keeping statistics. This was 2.9% of all children.
Many select moral or religious reasons for homeschooling their children. The second main category is "unschooling," those who prefer a non-standard approach to education.
Most homeschooling advocates are wary of the established educational institutions for various reasons. Some are religious conservatives who see nonreligious education as contrary to their moral or religious systems, or who wish to add religious instruction to the educational curriculum (and who may be unable to afford a church-operated private school or where the only available school may teach views contrary to those of the parents). Others feel that they can more effectively tailor a curriculum to suit an individual student’s academic strengths and weaknesses, especially those with singular needs or disabilities. Still others feel that the negative social pressures of schools (such as bullying, drugs, crime, sex, and other school-related problems) are detrimental to a child’s proper development. Parents often form groups to help each other in the homeschooling process, and may even assign classes to different parents, similar to public and private schools.
Opposition to homeschooling comes from varied sources, including teachers' organizations and school districts. The National Education Association, the largest labor union in the United States, has been particularly vocal in the past. Opponents' stated concerns fall into several broad categories, including fears of poor academic quality, and lack of socialization with others. At this time, over half of states have oversight into monitoring or measuring the academic progress of home schooled students, with all but ten requiring some form of notification to the state.
College and university
Post-secondary education in the United States is known as college or university and commonly consists of four years of study at an institution of higher learning. There are 4,495 colleges, universities, and junior colleges in the country. In 2008, 36% of enrolled students graduated from college in four years. 57% completed their undergraduate requirements in six years, at the same college they first enrolled in. The U.S. ranks 10th among industrial countries for percentage of adults with college degrees.
Like high school, the four undergraduate grades are commonly called freshman, sophomore, junior, and senior years (alternatively called first year, second year, etc.). Students traditionally apply for admission into colleges. Schools differ in their competitiveness and reputation; generally, the most prestigious schools are private, rather than public. Admissions criteria involve the rigor and grades earned in high school courses taken, the students' GPA, class ranking, and standardized test scores (Such as the SAT or the ACT tests). Most colleges also consider more subjective factors such as a commitment to extracurricular activities, a personal essay, and an interview. While colleges will rarely list that they require a certain standardized test score, class ranking, or GPA for admission, each college usually has a rough threshold below which admission is unlikely.
Engineering Hall at The University of Illinois
Once admitted, students engage in undergraduate study, which consists of satisfying university and class requirements to achieve a bachelor's degree in a field of concentration known as a major. (Some students enroll in double majors or "minor" in another field of study.) The most common method consists of four years of study leading to a Bachelor of Arts (B.A.), a Bachelor of Science (B.S.), or sometimes another bachelor's degree such as Bachelor of Fine Arts (B.F.A.), Bachelor of Social Work (B.S.W.), Bachelor of Engineering (B.Eng.,) or Bachelor of Philosophy (B.Phil.) Five-Year Professional Architecture programs offer the Bachelor of Architecture Degree (B.Arch.)
Professional degrees such as law, medicine, pharmacy, and dentistry, are offered as graduate study after earning at least three years of undergraduate schooling or after earning a bachelor's degree depending on the program. These professional fields do not require a specific undergraduate major, though medicine, pharmacy, and dentistry have set prerequisite courses that must be taken before enrollment.
Some students choose to attend a community college for two years prior to further study at another college or university. In most states, community colleges are operated either by a division of the state university or by local special districts subject to guidance from a state agency. Community colleges may award Associate of Arts (AA) or Associate of Science (AS) degree after two years. Those seeking to continue their education may transfer to a four-year college or university (after applying through a similar admissions process as those applying directly to the four-year institution, see articulation). Some community colleges have automatic enrollment agreements with a local four-year college, where the community college provides the first two years of study and the university provides the remaining years of study, sometimes all on one campus. The community college awards the associate's degree, and the university awards the bachelor's and master's degrees.
Graduate study, conducted after obtaining an initial degree and sometimes after several years of professional work, leads to a more advanced degree such as a master's degree, which could be a Master of Arts (MA), Master of Science (MS), Master of Business Administration (MBA), or other less common master's degrees such as Master of Education (MEd), and Master of Fine Arts (MFA). Some students pursue a graduate degree that is in between a master's degree and a doctoral degree called a Specialist in Education (Ed.S.).
After additional years of study and sometimes in conjunction with the completion of a master's degree and/or Ed.S. degree, students may earn a Doctor of Philosophy (Ph.D.) or other doctoral degree, such as Doctor of Arts, Doctor of Education, Doctor of Theology, Doctor of Medicine, Doctor of Pharmacy, Doctor of Physical Therapy, Doctor of Osteopathic Medicine, Doctor of Podiatry Medicine, Doctor of Veterinary Medicine, Doctor of Psychology, or Juris Doctor. Some programs, such as medicine and psychology, have formal apprenticeship procedures post-graduation, such as residencies and internships, which must be completed after graduation and before one is considered fully trained. Other professional programs like law and business have no formal apprenticeship requirements after graduation (although law school graduates must take the bar exam to legally practice law in nearly all states).
Entrance into graduate programs usually depends upon a student's undergraduate academic performance or professional experience as well as their score on a standardized entrance exam like the Graduate Record Examination (GRE-graduate schools in general), the Medical College Admission Test (MCAT), or the Law School Admission Test (LSAT). Many graduate and law schools do not require experience after earning a bachelor's degree to enter their programs; however, business school candidates are usually required to gain a few years of professional work experience before applying. 8.9 percent of students receive postgraduate degrees. Most, after obtaining their bachelor's degree, proceed directly into the workforce.
English in the classroom
An issue facing curricula today is the use of the English language in teaching. English is spoken by over 95% of the nation, and there is a strong national tradition of upholding English as the de facto official language[citation needed]. Some 9.7 million children aged 5 to 17 primarily speak a language other than English at home. Of those, about 1.3 million children do not speak English well or at all.
Language
English is the de facto national language. Although there is no official language at the federal level, some laws—such as U.S. naturalization requirements—standardize English. In 2010, about 230 million, or 80% of the population aged five years and older, spoke only English at home. Spanish, spoken by 12% of the population at home, is the second most common language and the most widely taught second language. Some Americans advocate making English the country's official language, as it is in at least twenty-eight states. Both Hawaiian and English are official languages in Hawaii by state law.
While neither has an official language, New Mexico has laws providing for the use of both English and Spanish, as Louisiana does for English and French. Other states, such as California, mandate the publication of Spanish versions of certain government documents including court forms. Many jurisdictions with large numbers of non-English speakers produce government materials, especially voting information, in the most commonly spoken languages in those jurisdictions.
Several insular territories grant official recognition to their native languages, along with English: Samoan and Chamorro are recognized by American Samoa and Guam, respectively; Carolinian and Chamorro are recognized by the Northern Mariana Islands; Spanish is an official language of Puerto Rico and is more widely spoken than English there.
Religion
The United States is officially a secular nation; the First Amendment of the U.S. Constitution guarantees the free exercise of religion and forbids the establishment of any religious governance. In a 2002 study, 59% of Americans said that religion played a "very important role in their lives", a far higher figure than that of any other wealthy nation. According to a 2007 survey, 78.4% of adults identified themselves as Christian, down from 86.4% in 1990.
Protestant denominations accounted for 51.3%, while Roman Catholicism, at 23.9%, was the largest individual denomination. The total reporting non-Christian religions in 2007 was 4.7%, up from 3.3% in 1990. Other religions include Judaism (1.7%), Buddhism (0.7%), Islam (0.6%), Hinduism (0.4%), and Unitarian Universalism (0.3%). The survey also reported that 16.1% of Americans described themselves as agnostic, atheist, or simply having no religion, up from 8.2% in 1990.
There are also Baha'i, Wiccan, Druid, Jain, Native American, humanist and Deist communities. Doubt about the existence of a god or gods is growing rapidly among Americans under 30. Polls show that overall American confidence in organized religion is declining, and that younger Americans in particular are becoming increasingly irreligious.
Culture
American culture is considered the most individualistic in the world. The American Dream, or the perception that Americans enjoy high social mobility, plays a key role in attracting immigrants. While the mainstream culture holds that the United States is a classless society,scholars identify significant differences between the country's social classes, affecting socialization, language, and values.
The American middle and professional class has initiated many contemporary social trends such as modern feminism, environmentalism, and multiculturalism. Americans' self-images, social viewpoints, and cultural expectations are associated with their occupations to an unusually close degree. While Americans tend greatly to value socioeconomic achievement, being ordinary or average is generally seen as a positive attribute.
Literature, philosophy, and the arts
In the 18th and early 19th centuries, American art and literature took most of its cues from Europe. Writers such as Nathaniel Hawthorne, Edgar Allan Poe, and Henry David Thoreau established a distinctive American literary voice by the middle of the 19th century. Mark Twain and poet Walt Whitman were major figures in the century's second half; Emily Dickinson, virtually unknown during her lifetime, is now recognized as an essential American poet. A work seen as capturing fundamental aspects of the national experience and character—such as Herman Melville's Moby-Dick (1851), Twain's The Adventures of Huckleberry Finn (1885), and F. Scott Fitzgerald's The Great Gatsby (1925)—may be dubbed the "Great American Novel".
Eleven U.S. citizens have won the Nobel Prize in Literature, most recently Toni Morrison in 1993. William Faulkner and Ernest Hemingway are often named among the most influential writers of the 20th century. Popular literary genres such as the Western and hardboiled crime fiction developed in the United States. The Beat Generation writers opened up new literary approaches, as have postmodernist authors such as John Barth, Thomas Pynchon, and Don DeLillo.
The transcendentalists, led by Thoreau and Ralph Waldo Emerson, established the first major American philosophical movement. After the Civil War, Charles Sanders Peirce and then William James and John Dewey were leaders in the development of pragmatism. In the 20th century, the work of W. V. O. Quine and Richard Rorty, and later Noam Chomsky, brought analytic philosophy to the fore of American philosophical academia. John Rawls and Robert Nozick led a revival of political philosophy.
In the visual arts, the Hudson River School was a mid-19th-century movement in the tradition of European naturalism. The realist paintings of Thomas Eakins are now widely celebrated. The 1913 Armory Show in New York City, an exhibition of European modernist art, shocked the public and transformed the U.S. art scene. Georgia O'Keeffe, Marsden Hartley, and others experimented with new, individualistic styles. Major artistic movements such as the abstract expressionism of Jackson Pollock and Willem de Kooning and the pop art of Andy Warhol and Roy Lichtenstein developed largely in the United States. The tide of modernism and then postmodernism has brought fame to American architects such as Frank Lloyd Wright, Philip Johnson, and Frank Gehry.
Though little known at the time, Charles Ives's work of the 1910s established him as the first major U.S. composer in the classical tradition, while experimentalists such as Henry Cowell and John Cage created a distinctive American approach to classical composition. Aaron Copland and George Gershwin developed a new synthesis of popular and classical music. Choreographers Isadora Duncan and Martha Graham helped create modern dance, while George Balanchine and Jerome Robbins were leaders in 20th-century ballet. Americans have long been important in the modern artistic medium of photography, with major photographers including Alfred Stieglitz, Edward Steichen, and Ansel Adams. The newspaper comic strip and the comic book are both U.S. innovations. Superman, the quintessential comic book superhero, has become an American icon.
Food
Mainstream American cuisine is similar to that in other Western countries. Wheat is the primary cereal grain. Traditional American cuisine uses indigenous ingredients, such as turkey, venison, potatoes, sweet potatoes, corn, squash, and maple syrup, which were consumed by Native Americans and early European settlers.
Slow-cooked pork and beef barbecue, crab cakes, potato chips, and chocolate chip cookies are distinctively American foods. Soul food, developed by African slaves, is popular around the South and among many African Americans elsewhere. Syncretic cuisines such as Louisiana creole, Cajun, and Tex-Mex are regionally important. 
Characteristic dishes such as apple pie, fried chicken, pizza, hamburgers, and hot dogs derive from the recipes of various immigrants. French fries, Mexican dishes such as burritos and tacos, and pasta dishes freely adapted from Italian sources are widely consumed. Americans generally prefer coffee to tea. Marketing by U.S. industries is largely responsible for making orange juice and milk ubiquitous breakfast beverages.
Sports
Baseball has been regarded as the national sport since the late 19th century, while American football is now by several measures the most popular spectator sport. Basketball and ice hockey are the country's next two leading professional team sports. College football and basketball attract large audiences. Boxing and horse racing were once the most watched individual sports, but they have been eclipsed by golf and auto racing, particularly NASCAR. Soccer continues to grow in the United States, as it's played widely at the youth and amateur levels. Tennis and many outdoor sports are popular as well.
While most major U.S. sports have evolved out of European practices, volleyball, skateboarding, snowboarding, and cheerleading are American inventions. Basketball was invented in Massachusetts by Canadian-born James Naismith. Lacrosse and surfing arose from Native American and Native Hawaiian activities that predate Western contact. Eight Olympic Games have taken place in the United States. The United States has won 2,301 medals at the Summer Olympic Games, more than any other country, and 253 in the Winter Olympic Games, the second most by 2006.
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