Cornwallis was defeated at Yorktown because:

On October 19, 1781, British General Charles Cornwallis surrendered his army of some 8,000 men to General George Washington at Yorktown, giving up any chance of winning the Revolutionary War. ... The Franco-American siege exhausted the British army's supplies of food and ammunition.

According to President Truman, what was the government's role in the postwar economy? Thegovernment should continue to regulate the economy.