The American Revolution was a political upheaval that took place between 1765 and 1783 during which rebels in the Thirteen American Colonies overthrew the authority of the British Crown and founded the United States of America. The American Revolution was the result of a series of social, political, and intellectual transformations in American society, government and ways of thinking. Starting in 1765 the Americans rejected the authority of the British Parliament to tax them; protests continued to escalate, as in the Boston Tea Party of 1773, and the British responded by imposing punitive laws the Coercive Acts on Massachusetts in 1774. The Patriots fought the British and loyalists in the American Revolutionary War (1775–1783. Resistance to the British was coordinated through the Second Continental Congress. Claiming King George III's rule was tyrannical and violated the rights of Englishmen, the Continental Congress declared the colonies free and independent states in July 1776. These thirteen states became known as the United States of America, a loose confederacy under the 1777 Articles of Confederation. The Patriot leadership professed the political philosophies of liberalism and republicanism to reject monarchy and aristocracy, and proclaimed that all men are created equal. Congress rejected British proposals for compromise that would keep them under the king. The British were forced out of Boston in 1776, but then captured and held New York City for the duration of the war, nearly capturing General Washington and his army. The British blockaded the ports and captured other cities for brief periods, but failed to defeat Washington's forces. In early 1778, after an invading British army from Canada was captured by the Americans, the French entered the war as allies of the United States. The naval and military power of the two sides were about equal, and France had allies in the Netherlands and Spain, while Britain had no major allies in this large-scale war. The war later turned to the American South, where the British captured an army at South Carolina, but failed to enlist enough volunteers from Loyalist civilians to take effective control. A combined American–French force captured a second British army at Yorktown in 1781, effectively ending the war in the United States. A peace treaty in 1783 confirmed the new nation's complete separation from the British Empire. The United States took possession of nearly all the territory east of the Mississippi River and south of the Great Lakes, with the British retaining control of Canada and Spain taking Florida. Among the significant results