December 18th:
According to Wikipedia and other sources, on December 18th:
1777 – The United States celebrates its first Thanksgiving, marking the recent victory by the Americans over British General John Burgoyne in the Battle of Saratoga in October.
1878 – John Kehoe, the last of the Molly Maguires is executed in Pennsylvania.
1886 – Ty Cobb, American baseball player (d. 1961)
1932 – The Chicago Bears defeat the Portsmouth Spartans 9–0 in the first ever NFL Championship Game. Because of a blizzard, the game is moved from Wrigley Field to the Chicago Stadium, the field measuring 80 yards (73 m) long.
1966 – Saturn's moon Epimetheus is discovered by Richard L. Walker.