Final answer:
Britain ratified the Treaty of Paris in 1783, which recognized the independence of the United States and marked the end of the American Revolutionary War.
Step-by-step explanation:
Britain ratified the Treaty of Paris in 1783, officially ending the American Revolutionary War. This critical agreement recognized the independence of the United States, established boundaries for the new nation, and set terms for peace after years of conflict. The ratification followed victories by the United States, assistance from France, and the realization by the British government that continued war efforts were untenable. The treaty was signed on September 3, 1783, by representatives of King George III and representatives of the United States, led by Benjamin Franklin, John Adams, and John Jay. It marked the end of hostilities and the beginning of a period of peace between Britain and the newly independent United States, although some terms of the treaty were not perfectly followed and tensions continued, eventually leading to the War of 1812.