Dec. 26, 2004 An underwater earthquake occurs off the coast of Indonesia, causing a tsunami that eventually kills an estimated 230,000 people.
Dec. 27, 1932 Amid the Great Depression, Radio City Music Hall opens in New York City.
Dec. 29, 1845 Texas joins the Union as the 28th state.
Dec. 30, 1922 The Union of Soviet Socialist Republics is established.
Jan. 1, 1863 President Abraham Lincoln signs the Emancipation Proclamation, freeing slaves in non-Union states.