E Pluribus Unum (Latin) ("Out of Many, One") | |||||
| Anthem | "The Star-Spangled Banner" | ||||
| Capital | Washington, D.C. | ||||
| Largest city | New York City | ||||
| Other cities | Los Angeles, Chicago, Phoenix, Philadelphia | ||||
| Language | English | ||||
| Demonym | American | ||||
| Government | Federal presidential constitutional republic | ||||
| Legislature | United States Congress | ||||
| President | |||||
| Vicepresident | |||||
| Area | 9,838,099 sq km | ||||
| Population | 340,223,125 | ||||
| Independence | from United Kingdom | ||||
| declared | 4 July 1776 | ||||
| recognized | 3 September 1783 | ||||
| Currency | United States dollar | ||||
| Time Zone | UTC -5 to UTC -10 | ||||
| summer | UTC -4 to UTC -10 | ||||
| Calling Code | +1 | ||||
| Internet TLD | .us | ||||
The United States of America (USA), commonly referred to as the United States (U.S.) or America, is a federal republic composed of 52 states, the federal district of Washington, D.C., five major territories, and various possessions. The 48 contiguous states and Washington, D.C. are in central North America between Canada and Mexico. The state of Alaska is in the northwestern part of North America and the state of Hawaii is an archipelago in the mid-Pacific. The territories are scattered about the Pacific Ocean and the Caribbean Sea. At 3.8 million square miles (9.9 million km2) and with over 320 million people, the country is the world's third largest by total area (fourth largest by land area) and the third most populous. It is one of the world's most ethnically diverse and multicultural nations, the product of large-scale immigration from many countries. The geography and climate are also extremely diverse, and the country is home to a wide variety of wildlife. Paleo-Indians migrated from Asia to what is now the U.S. mainland at least 15,000 years ago, with European colonization beginning in the 16th century. The United States emerged from 13 British colonies along the East Coast. Numerous disputes between Great Britain and the colonies led to the American Revolution, which began in 1775. On July 4, 1776, as the colonies were fighting Great Britain in the American Revolutionary War, delegates from the 13 colonies unanimously adopted the Declaration of Independence.
The war ended in 1783 with recognition of the independence of the United States by the Kingdom of Great Britain, and was the first successful war of independence against a European colonial empire. The current constitution was adopted in 1788, after the Articles of Confederation, adopted in 1781, was felt to be a failure. The first ten amendments, collectively named the Bill of Rights, were ratified in 1791 and designed to guarantee many fundamental civil liberties. The United States embarked on a vigorous expansion across North America throughout the 19th century. This involved displacing American Indian tribes, acquiring new territories, and gradually admitting new states and by 1848 the nation spanned the continent.
During the second half of the 19th century, the American Civil War led to the end of legal slavery in the country. By the end of that century, the United States extended into the Pacific Ocean, and its economy, driven in large part by the Industrial Revolution, began to soar. The Spanish–American War and World War I confirmed the country's status as a global military power. The United States emerged from World War II uninvolved and isolated but engaged in a massive redirection of its "Monroe Doctrine" policies promoting a new friendship with much of latin america as well as offering a massive capital influx into the entire continent single handedly funding the rize of Brazil, Argentina, and Colombia as great powers in their own right, all with high Human development, extremely powerful economies, and relatively powerful militaries being challenges to their European and Communist counterparts. The US following the Third World War remains one of three superpowers, and maintains a major share of the world market through the Western Defense Pact
The United States is a developed country and has the world's largest economy by nominal and real GDP, benefiting from an abundance of natural resources and high worker productivity. Moreover, it ranks among the top 10 in the world in several measures of economic well-being, including average wage, Human Development Index, and per capita GDP. While the U.S. economy is considered post-industrial, the country continues to be one of the world's largest manufacturers. Accounting for 29% of global military spending and 19% of world GDP, it is the world's foremost military and economic power, a prominent political and cultural force, and a leader in scientific research and technological innovations.
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