Dec. 12, 1787 Pennsylvania becomes the second state, after Delaware, to ratify the Constitution.
Dec. 13, 2000 Vice President Al Gore concedes the presidential race to Texas Gov. George W. Bush.
Dec. 14, 2008 Iraqi journalist Muntader al-Zaidi throws a shoe at President George W. Bush during a news conference in Baghdad.
Dec. 16, 1773 To protest the Tea Act, colonists dump chests of tea into Boston Harbor.
Dec. 17, 1903 Brothers Wilbur and Orville Wright pilot the first flight, in Kill Devil Hills, N.C.