2020 2021 America Trip
The United States of America (USA), commonly known as the United States (U.S. or US) or America, is a country mostly located in central North America, between Canada and Mexico. It consists of 50 states, a federal district, five major self-governing territories, and various possessions.[h] At 3.8 million square miles (9.8 million km2), it is the world’s third- or fourth-largest country by total area.[d] With a 2019 estimated population of over 328 million, the U.S. is the third most populous country in the world. Americans are a racially and ethnically diverse population that have been shaped through centuries of immigration. The capital is Washington, D.C., and the most populous city is New York City.
Paleo-Indians migrated from Siberia to the North American mainland at least 12,000 years ago, and European colonization began in the 16th century. The United States emerged from the thirteen British colonies established along the East Coast. Numerous disputes between Great Britain and the colonies led to the American Revolutionary War lasting between 1775 and 1783, leading to independence. Beginning in the late 18th century, the United States vigorously expanded across North America, gradually acquiring new territories, oftentimes killing and displacing Native Americans, and admitting new states. By 1848, the United States spanned the continent. Slavery was legal in the southern United States until the second half of the 19th century, when the American Civil War led to its abolition.
The Spanish–American War and World War I established the U.S. as a world power, a status confirmed by the outcome of World War II. It was the first country to develop nuclear weapons and is the only country to have used them in warfare. During the Cold War, the United States and the Soviet Union competed in the Space Race, culminating with the 1969 Apollo 11 mission, the spaceflight that first landed humans on the Moon. The end of the Cold War and collapse of the Soviet Union in 1991 left the United States as the world’s sole superpower.
The United States is a federal republic and a representative democracy. It is a founding member of the United Nations, World Bank, International Monetary Fund, Organization of American States (OAS), NATO, and other international organizations. It is a permanent member of the United Nations Security Council.
A highly developed country, the United States is the world’s largest economy and accounts for approximately a quarter of global gross domestic product (GDP). The United States is the world’s largest importer and the second-largest exporter of goods, by value. Although its population is only 4.3% of the world total, it holds 29.4% of the total wealth in the world, the largest share held by any country. Despite income and wealth disparities, the United States continues to rank high in measures of socioeconomic performance, including average wage, median income, median wealth, human development, per capita GDP, and worker productivity. It is the foremost military power in the world, making up more than a third of global military spending, and is a leading political, cultural, and scientific force internationally.
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