United States of America Statistics, Facts and Figures from CityBloc.com
The United States of America is a federal democratic republic situated primarily in North America. Because of its economic, cultural and military strength, the U.S. is considered a superpower. It comprises 50 states and one federal district, and has several territories. It is also referred to, with varying formality, as the United States, the U.S., the U.S.A., the States, or simply and most commonly, America.
The country celebrates its founding date as July 4 1776, when the Second Continental Congress — representing thirteen British colonies — adopted the Declaration of Independence. However, the structure of the government was profoundly changed in 1789, when the states replaced the Articles of Confederation with the United States Constitution. The date on which each of the fifty states adopted the Constitution is typically regarded as the date that state "entered the Union" (became part of the United States). Since the mid-20th century, following World War II, the United States has emerged as a dominant global influence in economic, political, military, scientific, technological, and cultural affairs.
American history started with the migration of people from Asia across the Bering land bridge approximately 12,000 years ago following large animals that they hunted into the Americas. These Native Americans left evidence of their presence in petroglyphs, burial mounds, and other artifacts. It is estimated that 2–9 million people lived in the territory now occupied by the U.S. before European contact, and the subsequent introduction of foreign diseases such as smallpox that greatly diminished the native populations. Some advanced societies were the Anasazi of the southwest, who inhabited Chaco Canyon, and the Woodland Indians, who built Cahokia, located near present-day St Louis, a city with a population of 40,000 at its peak in AD 1200.
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