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CDC is committed to stopping violence before it begins."United States of America", "America", "US", and "USA" redirect here.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 state of Hawaii is an archipelago in the mid-Pacific Ocean. The extremely diverse geography, climate, and wildlife of the United States make it one of the world's 17 megadiverse countries. The United States emerged from the thirteen British colonies established along the East Coast.The current constitution was adopted in 1788, with the first ten amendments, collectively named the Bill of Rights, being ratified in 1791 to guarantee many fundamental civil liberties.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.
Cities eventually dotted the coast to support local economies and serve as trade hubs.After Spain sent Columbus on his first voyage to the New World in 1492, other explorers followed.The first Europeans to arrive in territory of the modern United States were Spanish conquistadors such as Juan Ponce de León, who made his first visit to Florida in 1513; however, if unincorporated territories are accounted for, then credit would go to Christopher Columbus who landed in Puerto Rico on his 1493 voyage.Despite continuing new arrivals, the rate of natural increase was such that by the 1770s only a small minority of Americans had been born overseas.In 1774 the Spanish Navy ship Santiago, under Juan Pérez had entered and anchored in the inlet at Nootka Sound.
For the landmass comprising North, Central and South America, see Americas. C., and the largest city by population is New York City.