If you take in December 6, 7 and 8 in total a lot of events have happened over the years:
Dec. 6, 1865 The 13th Amendment to the US Constitution is ratified, banning
slavery.
Dec. 6, 1884 The Washington Monument in Washington D.C. is completed.
Dec. 6, 1917 the largest man-made explosion in recorded history, (until the Trinity test explosions of atomic bomb!), occurred in Halifax, Nova Scotia when a munitions explosion kills more than 1,900 people and destroys part of the city too!
Dec. 7, 1941 WWII - the attack on Pearl Harbor.
Dec. 7, 1972 Apollo 17 launches, the last moon mission.
Dec. 8, 1980 the subject of this thread occurs.
Dec. 8, 2004 Omg, this is incredible video taken at the moment of the shots being fired:
Dimebag Darrel Shooting...