United States of America


November 28, 2021

The United States of America (commonly referred to as United States, in English: United States of America or even just United States; in acronym USA) is a federal republic of North America made up of fifty states and a federal district. The forty-eight contiguous states and the Washington D.C. district (the federal capital) occupy the central strip of North America between Canada and Mexico and are bathed by the Atlantic Ocean to the east and the Pacific Ocean to the west. With 9850476 km² in total and approximately 331 million inhabitants, the United States is the fourth country in the world by area and third by population. The geography and climate of the United States is extremely diverse, with deserts, plains, forests, and mountains that are also home to a huge variety of wildlife. It is one of the most multi-ethnic and multicultural nations in the world, a large-scale product of immigration from many countries. Some territories in free political association are also dependent on the United States, which in any case are not part of any State of the Union or of the Federation in the strict sense. They are: Puerto Rico, American Samoa, the Northern Mariana Islands, the US Virgin Islands and Guam. Historically, Paleo-Americans migrated from Asia to what is the United States about 12,000 years ago. European colonization began around 1600 and mostly came from England. The United States of America originated from the thirteen British colonies located along the Atlantic coast. The disputes between Great Britain and the colonies resulted in a conflict: on 4 July 1776 the delegates of the thirteen colonies drafted and unanimously approved the declaration of independence, which officially gave birth to a new federal state. The American War of Independence, which ended with the recognition of US independence from the Kingdom of Great Britain, was the first war for independence from a European colonial power. The Constitution was adopted on September 17, 1787 and has since been amended twenty-seven times. The first ten amendments, collectively called the Bill of Rights, were ratified in 1791 and guarantee civil rights and fundamental freedoms. The United States embarked on vigorous expansion throughout the 19th century, propelled by the controversial doctrine of manifest destiny. The acquisition of new territories and the admission of new member states also caused numerous wars with the native peoples. The American Civil War ended with the abolition of slavery in the United States. At the end of the 19th century, the United States extended to the Pacific Ocean. 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 as a global superpower, the first country with nuclear weapons, and as one of the five permanent members of the United Nations Security Council. After a serious political and social crisis in the 1960s and 1970s as a result of the defeat in the Vietnam War, which seemed to undermine US world dominance, the unexpected end of the Cold War and the dissolution of the Soviet Union in the 1990s have instead confirmed the dominant role of the United States which remained the only military and political superpower in the world. The United States is a developed country, with an estimated gross domestic product (GDP) in 2017 of $ 19.39 trillion (23% of world GDP at purchasing power parity, as of 2011). The per capita GDP of the United States has been the sixth highest in the world since 2010, although the income inequality of the American continent was also ranked the highest within the OECD and countries by the World Bank. The economy is powered by an abundance of na resources

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