Which event led to the end of the Revolutionary War at Yorktown?

Question

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The French forces, under the leadership of General Rochambeau and Admiral de Grasse, were able to take control of the Chesapeake Bay, preventing reinforcements from reaching General Cornwallis's army. This allowed General George Washington and his troops, along with the French army, to lay siege to Cornwallis's troops in Yorktown, ultimately leading to the surrender of Cornwallis's army and the end of the Revolutionary War.

Which Event Led to the End of the Revolutionary War