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usa(america)The United States of America, also referred to in short form as the United States, the USA, or simply the US, and colloquially as America, is a country in North America that extends from the Atlantic Ocean to the Pacific Ocean, and shares land borders with Canada and Mexico. The United States is a federal constitutional republic, with its capital in Washington, D.C.At over 3.7 million square miles (over 9.6 million km²), the U.S. (including its non-contiguous and overseas states and territories) is the third largest country by total area. It is the world's third most populous nation, with over 300 million people.[2]The USA was founded by 13 colonies that declared their independence from Great Britain, on 4 July 1776, under the name The United States of America, and were recognized by Britain as sovereign states in 1783. The United States has existed continuously as a united, sovereign, national state since it adopted the Articles of Confederation, on 1 March 1781. The nation's form of government was significantly altered when it adopted the current Constitution, the Articles' replacement, on 17 September 1787. American military, economic, cultural, and political influence increased through the 19th and 20th centuries. With the collapse of the Soviet Union at the end of the Cold War, the nation emerged as the world's sole remaining superpower,[3] greatly influencing world affairs, as it continues to do today.canada:Canada (pronounced /'kʰænədə/ in English and /kanadɔ/ in Canadian French[1]) is the world's second-largest country by total area, occupying most of northern North America. Extending from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, Canada shares land borders with the United States to the south and to the northwest.Inhabited first by aboriginal peoples, Canada was founded as a union of British colonies (some of which were formerly French colonies). Canada gained independence from the United Kingdom in an incremental process that began in 1867 and ended in 1982; it remains a Commonwealth Realm.Canada is a federal constitutional monarchy with parliamentary democracy. Comprising ten provinces and three territories, Canada is a bilingual and multicultural country, with both English and French as official languages at the federal level. A technologically advanced and industrialized nation, Canada maintains a diversified economy that is heavily reliant upon its abundant natural resources and upon trade ― particularly with the United States, with which Canada has had a long and complex relationship