The Vietnam War lasted from 1950-1975 between North Vietnam supported by China and the Soviet Union against South Vietnam supported by the United States. Key events included the division of Vietnam along the 17th parallel in 1954, the Gulf of Tonkin Resolution that escalated US involvement, and the Tet Offensive that turned US public opinion against the war. Tactics like search and destroy bombings, use of napalm and agent orange took a toll on Vietnamese civilians and the environment. Protests against the war within the US grew until the US withdrawal was completed in 1973, ending in the fall of Saigon to communist forces in 1975.