The event that ended the American Revolutionary War was the signing of the Treaty of Paris in 1783. This treaty officially recognized the independence of the thirteen American colonies from British rule. It concluded the war, which had lasted from 1775 to 1783, and established the boundaries of the new nation, including territory west to the Mississippi River. The treaty was a significant victory for the United States and marked a turning point in world history, as it encouraged other nations to seek independence from colonial powers.