The treaty that confirmed U.S. independence from Britain was the Treaty of Paris, signed in 1783. This pivotal agreement formally ended the American Revolutionary War, recognizing the United States as an independent nation. It established territorial boundaries, granting the U.S. access to lands westward to the Mississippi River,which was a crucial aspect of nation-building. The treaty also addressed issues like fishing rights and debt repayment. The political recognition obtained through this treaty marked a significant change in international relations, symbolizing the success of the American struggle for independence and inspiring other countries to pursue similar aspirations.