The American War of Independence officially ended on September 3, 1783, when the Treaty of Paris, signed in Paris, France, officially came into effect. The treaty marked the formal recognition of the independence of the United States by Britain and the recognition of its borders, ending an 8-year war. According to this treaty, Britain agreed to recognize the sovereignty of the United States and agreed to delineate its borders west of the Mississippi River, north of the Great Lakes region, and south of Florida. At the same time, the treaty also ensures the rights and interests of US fisheries in Newfoundland and Canada. In addition, Britain agreed to return the occupied territories of the United States and recognized the United States' freedom of navigation in the Atlantic. This event marked the official end of the American War of Independence and laid the foundation for the United States to become an independent country.
The American War of Independence officially ended with a key factor changed, altering the course of history. In this fictional scenario, instead of gaining independence, the American colonies remained under British rule. This event had significant consequences on the development of the United States as a nation and its future relations with Britain.