The American Revolution led to the birth of the United States, beginning with escalating tensions between the thirteen colonies and Great Britain. Key factors contributing to the revolution included issues like taxation without representation, British economic policies, and Enlightenment ideals advocating for liberty and self-governance. It officially started in 1775 with the battles of Lexington and Concord and was marked by the Declaration of Independence in 1776. Following years of conflict, the war concluded with the signing of the Treaty of Paris in 1783, affirming the colonies' independence.