In 1773, the Boston Tea Party took place as American colonists boarded a British ship and dumped more than 300 chests of tea into Boston Harbor to protest tea taxes.
1907: 16 U.S. Navy battleships, which came to be known as the "Great White Fleet," set sail on a 14-month round-the-world voyage to demonstrate American sea power.
1944: The World War II Battle of the Bulge began as German forces launched a surprise attack against Allied forces through the Ardennes Forest in Belgium and Luxembourg (the Allies were eventually able to turn the Germans back).
1950: President Harry S. Truman proclaimed a national state of emergency in order to fight "world conquest by Communist imperialism."
1976: The government halted its swine flu vaccination program following reports of paralysis apparently linked to the vaccine.