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The United States of America (USA), commonly known as the United States (U. C., and the largest city by population is New York City.S.) or America, is a federal republic composed of 50 states, a federal district, five major self-governing territories, and various possessions. Forty-eight states and the capital's federal district are contiguous and located in North America between Canada and Mexico.The state of Alaska is in the northwest corner of North America, bordered by Canada to the east and across the Bering Strait from Russia to the west. territories are scattered about the Pacific Ocean and the Caribbean Sea, stretching across nine official time zones.
The United States embarked on a vigorous expansion across North America throughout the 19th century, acquiring new territories, as a global superpower, the first country to develop nuclear weapons, the only country to use them in warfare, and a permanent member of the United Nations Security Council.The United States is a founding member of the United Nations, World Bank, International Monetary Fund, Organization of American States (OAS), and other international organizations. The singular form—e.g., "the United States is"—became popular after the end of the American Civil War. In English, the word "American" rarely refers to topics or subjects not connected with the United States.The United States is a highly developed country, with the world's largest economy by nominal GDP and second-largest economy by PPP, accounting for approximately a quarter of global GDP. Joseph Reed, Moylan expressed his wish to carry the "full and ample powers of the United States of America" to Spain to assist in the revolutionary war effort. The singular form is now standard; the plural form is retained in the idiom "these United States". S." refer to the country adjectivally ("American values", "U. Monks Mound in Cahokia, a UNESCO World Heritage Site and the largest and most influential settlement in Mississippian culture.Three UNESCO World Heritage Sites located in the United States are credited to the Pueblos: Mesa Verde National Park, Chaco Culture National Historical Park and Taos Pueblo.In the southern Great Lakes region, the Iroquois Confederacy (Haudenosaunee) was established at some point between the twelfth After his initial landfall in January 1778 at Waimea harbour, Kauai, Cook named the archipelago the "Sandwich Islands" after the fourth Earl of Sandwich—the acting First Lord of the Admiralty of the British Royal Navy.