The significance of the Treaty of Paris in U.S. history lies in its role in formally ending the American Revolutionary War in 1783. This treaty acknowledged the independence of the United States from Great Britain, establishing borders and facilitating westward expansion. It marked a turning point in international relations as the U.S. emerged as a sovereign nation. The Treaty also laid the foundation for future diplomatic relations and territorial negotiations. Its lasting impact is seen in the establishment of the United States as a key player on the world stage and the beginning of a new era in governance.