The American Revolution officially began in 1775, marked by events such as the Battles of Lexington and Concord. Tensions between the thirteen American colonies and British authorities had been escalating for years, fueled by issues like taxation without representation. The Declaration of Independence, adopted on July 4, 1776, later articulated the colonies' desire for freedom and self-governance. This revolutionary struggle ultimately led to the establishment of the United States and set foundational ideals for democracy and human rights that would inspire future movements around the world.