-On September 9, 1776, the Continental Congress named the country formerly known as the United Colonies as the United States of America. American Revolution (1775-1783), conflict between 13 British colonies in North America and their parent country, Great Britain. It was made up of two related events: the American War of Independence (1775-1783) and the formation of the American government as laid out by the Constitution of the United States in 1787. First, the war achieved independence from Great Britain by the colonies. Second, the newly created United States of America established a republican form of government, in which power resided with the people.
The revolution had many causes. Long-term social, economic, and political changes in the colonies before 1750 provided the basis for an independent nation with representative political institutions. More immediately, the French and Indian War (1754-1763) changed the relationship between the colonies and their mother country. Finally, a decade of conflicts between the British government and the colonists, beginning with the Stamp Act crisis in 1765, led to the outbreak of war in 1775 and the Declaration of Independence in 1776. The American Declaration of Independence had already been issued months ago on July 4th.The year 1776 has been named as the year of US independence.