when was the us founded as a country
United States Paleo-Indians migrated from Asia to the North American mainland at least 15,000 years ago.[25] European colonization began in the 16th century. The United States emerged from 13 British colonies along the East Coast. Numerous disputes between Great Britain and the colonies following the Seven Years' War led to the American Revolution, which began in 1775, and the subsequent Declaration of Independence in 1776. The war ended in 1783 with the United States becoming the first country to attain independence from a European power.[26] The current constitution was adopted in 1788. The first ten amendments, collectively named the Bill of Rights, were ratified in 1791 and designed to guarantee many fundamental civil liberties.
History of the United States (1776–89) On July 2, 1776, the Second Continental Congress, still meeting in Philadelphia, voted unanimously to declare the independence as the "United States of America". Two days later, on July 4, Congress adopted the Declaration of Independence. The drafting of the Declaration was the responsibility of a Committee of Five, which included, among others, John Adams and Benjamin Franklin; it was drafted by Thomas Jefferson and revised by the others and the Congress as a whole. It contended that "all men are created equal" with "certain unalienable rights, that among these are life, liberty, and the pursuit of happiness", and that "to secure these rights governments are instituted among men, deriving their just powers from the consent of the governed", as well as listing the main colonial grievances against the crown.[22] July 4 ever since has been celebrated as the birthday of the United States.