12/18/1856 - The 13th Amendment abolished slavery in the United States.
12/19/1843 - Charles Dickens' book "A Christmas Carol" is published.
12/20/1803 - The United States purchased the Louisiana Territory from France for $15 million.
12/21/1620 - The Pilgrims landed in Plymouth, Mass.
12/22/1956 - Colo, becomes the first gorilla born into captivity.
12/23/1986 - The aircraft Voyager completes its first round-the-world flight.
12/24/1923 - President Calvin Coolidge lights the first national Christmas tree.