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The United States of America (USA or USA), commonly known as the United States of America (US or US) or America, is a country in North America. It consists of 50 states, federal districts, 5 major unincorporated territories, 9 minor islands[j], and 326 Indian reservations. It is her third largest country in the world both in terms of land area and total area. [d] The United States is bordered by Canada to the north and Mexico to the south. It has maritime borders with the Bahamas, Cuba, Russia, and other countries. [k]Population exceeds her 331 million, [e] the most populous country in the Americas and her third most populous country in the world. The capital is Washington DC and the most populous city and financial center is New York City.Paleo-Aboriginal people migrated from Siberia to mainland North America at least 12,000 years ago, after which an advanced culture began to emerge. These advanced cultures had almost completely declined by the time Europeans arrived in North America and began colonizing the continent. The United States emerged from 13 British colonies when disputes with the British royal family over taxation and political representation led to the American Revolution (1765-1784) and established the country's independence. In the late 18th century, the United States began to expand across North America, gradually gaining new territories, sometimes through warfare, frequently expelling Native Americans and admitting new states. By 1848, the United States had expanded its continent from east to west. Controversy over the practice of slavery culminated in the secession of the Confederate States, which fought the rest of the Confederate States during the American Civil War (1861-1865). With the Union's victory and preservation, slavery was abolished by the 13th Amendment. By 1900, the United States was the world's largest economy, and the Spanish-American War and World War I established the United States as a world power. After the Japanese attack on Pearl Harbor in 1941, the United States entered World War II on the Allied side. In the aftermath of the war, the United States and the Soviet Union lost their two superpower status in the world. During the Cold War, the two countries engaged in struggles for ideological control but avoided direct military conflict. They also participated in a space race, culminating in 1969 with the American space flight that landed the first man on the moon. At the same time, the civil rights movement led to laws repealing state and local Jim Crow laws and other codified racism against African Americans. With the collapse of the Soviet Union in 1991, the Cold War ended and the United States became the world's sole superpower. As a result of her 9/11 attacks in 2001, the United States launched the War on Terror. This included the Afghanistan War (2001-2021) and the Iraq War (2003-2011). The United States includes a bicameral Congress 3 It is a federal republic with two independent government agencies. liberal democracy and market economy. It ranks high on international measures of human rights, quality of life, income and wealth, economic competitiveness and education. And the level of perceived corruption is low. It has high levels of incarceration and inequality, allows the death penalty and lacks universal healthcare. The United States, a melting pot of cultures and peoples, has been shaped by centuries of immigration.The United States is a highly developed country whose economy accounts for approximately one-fourth of the world's GDP and is the world's largest in terms of GDP at market exchange rates. By value, the United States is the world's largest importer and second largest exporter. The United States accounts for just over 4.2% of her total global population, but holds more than 30% of her total global wealth, the largest share of any country. The United States is a founding member of the United Nations, World Bank, International Monetary Fund, Organization of American States, NATO, and a permanent member of the United Nations Security Council. The country accounts for more than a third of the world's military spending, making it the world's largest military powerhouse and a major political, cultural and scientific force.
