The American Revolution was a war between the 13 American colonies and Great Britain from 1775-1783 that resulted in American independence. The war was caused by high taxes imposed on the colonies, lack of colonial representation in Parliament, and restrictions on westward expansion. Key events included the Boston Massacre, Boston Tea Party, and Intolerable Acts, leading the colonies to formally declare independence in 1776. With support from France and Spain, and victories like the Battle of Trenton, the colonists were eventually able to defeat the British forces, leading to recognition of the United States as an independent nation in the 1783 Treaty of Paris.