April 30 (UPI) -- On this date in history: In 1789, George Washington was inaugurated as the first president of the United States. In 1803, the United States more than doubled its land area with the Louisiana Purchase. It obtained all French territory west of the Mississippi River for $15 million. In 1812, Louisiana entered the union as the 18th U.S. state. In 1927, Douglas Fairbanks and Mary Pickford became the first movie personalities to leave their footprints in concrete at Grauman's Chinese Theater in Hollywood. File Photo by Jim Ruymen/UPI In 1939, Franklin D. Roosevelt became the first U.S....