A civil rights protest was staged at a white-only bowling alley in Orangeburg, South Carolina. It was broken up by highway patrolmen. http://en.wikipedia.org/wiki/1968
NVA catches American base at Khe Sahn by surprise by launching the Tet Offensive. The Tet Offensive was when all of Vietnam had a temporary cease fire to celebrate the Vietnamese New Year and the NVA attacked American bases.
About 4,500 troops of the U.S. 4th Division and 173rd Airborne Brigade face off 6,000 North Vietnamese troops of the 174th regiment. U.S. casualities number 285 killed and 985 wounded. http://www.historycentral.com/vietnam/dakto.html