During this time the United States became involved in the Vietnam War as part of the global Cold War. This war would later prove to be highly divisive in American society, and American troops were withdrawn from Indochina in 1975 with the Khmer Rouge's capture of Phnom Penh on April 17, the Vietnam People's Army's capture of Saigon on April 30 and the Pathet Lao's capture of Vientiane on December 2.