Dec. 21 (UPI) -- On this date in history: In 1620, the Pilgrims arrived at Plymouth, Mass., following a 63-day voyage from England aboard the Mayflower. Advertisement In 1864, Union Gen. William T. Sherman completed his Civil War "march to the sea" across the South and arrived in Savannah, Ga. In 1913, the first crossword puzzle in an American newspaper appeared in The New York Sunday World. In 1937, Walt Disney's Snow White and the Seven Dwarfs , the first full-length animated feature film,