What king sent representatives to sign the treaty that is the reason Clark has often been hailed as the "Conqueror of the Old Northwest"?
George Rogers Clark:  Because the British ceded the entire Northwest Territory to the United States in the 1783 Treaty of Paris, Clark has often been hailed as the "Conqueror of the Old Northwest". Treaty of Paris (1783): The Treaty of Paris, signed in Paris by representatives of King George III of Great Britain and representatives of the United States of America on September 3, 1783, ended the American Revolutionary War.
King George III