Why was the Siege of Yorktown important to the outcome of the American Revolution?

The Siege of Yorktown (September 28–October 19, 1781) was the decisive military campaign of the American Revolution. By entrapping the British army under General Lord Cornwallis on the Yorktown Peninsula, the joint Franco-American forces effectively ended major military operations in the war.12

The importance of the siege lies in the successful coordination of land and sea forces:
* Strategic Containment: The Marquis de Lafayette played a critical role by blocking Cornwallis’s potential escape by land, while George Washington and the comte de Rochambeau marched their combined forces south to complete the encirclement.1
* Naval Superiority: The arrival of a French fleet under the comte de Grasse prevented British naval intervention, cutting off Cornwallis’s escape route and supply lines by sea.12

The surrender of approximately 8,000 British troops forced the British to recognize the conflict as unwinnable, virtually assuring the success of the American cause and bringing the war to a swifter conclusion.12