Vietnam War: Operation Linebacker II ends.
29 December 1998
Leaders of the Khmer Rouge apologize for the Cambodian genocide that claimed over one million lives
25 December 1868
Pardons for ex-Confederates: United States President Andrew Johnson grants an unconditional pardon to all Confederate veterans.
23 December 1972
The Immaculate Reception is caught by Franco Harris to win the Pittsburgh Steelers their first ever playoff victory, after defeating the Oakland Raiders.
22 December 1975
U.S. President Gerald Ford creates the Strategic Petroleum Reserve in response to the 1970s energy crisis.
21 December 1913
Arthur Wynne’s “word-cross”, the first crossword puzzle, is published in the New York World.