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The United States of America (USA or U.S.A.), commonly known as the United States (US or U.S.) or America, is a country primarily located in North America. It is a federal union of 50 states, the federal capital district of Washington, D.C., and 326 Indian reservations. [j] The 48 contiguous states border Canada to the north and Mexico to the ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 9 September 2024. "American history" redirects here. For the history of the continents, see History of the Americas. Further information: Economic history of the United States Current territories of the United States after the Trust Territory of the Pacific Islands was given independence in 1994 This ...
Jimmy Carter 's retirement, currently 43 years, is the longest in American presidential history. Additionally, at age 99, Carter is the oldest of the six living U.S. presidents [2] as well as the nation's longest-lived former president. [8] Barack Obama, at age 63, is the youngest living former president.
The United States achieved independent governance with the Lee Resolution and the Declaration of Independence in July 1776. Following the American Revolutionary War, the Articles of Confederation were adopted in 1781 to establish the federal government.
Thomas Jefferson becomes the 3rd president of the United States on March 4, 1801. First Barbary War, 1801–1805. The Territory Northwest of the River Ohio is admitted to the Union as the State of Ohio (the 17th state) on March 1, 1803. The United States takes possession of the Louisiana Purchase, December 20, 1803.
The following table is a list of all 50 states and their respective dates of statehood. The first 13 became states in July 1776 upon agreeing to the United States Declaration of Independence, and each joined the first Union of states between 1777 and 1781, upon ratifying the Articles of Confederation, its first constitution. [6]
The United States Constitution has served as the supreme law of the United States since taking effect in 1789. The document was written at the 1787 Philadelphia Convention and was ratified through a series of state conventions held in 1787 and 1788. Since 1789, the Constitution has been amended twenty-seven times; particularly important ...
Under the law, the Immigration and Nationality Act of 1965, [121] the number of first-generation immigrants living in the United States has increased, [122] from 9.6 million in 1970 to about 38 million in 2007. [123] Around a million people legally immigrated to the United States per year in the 1990s, up from 250,000 per year in the 1950s. [124]