The document provides an overview of the key causes and events of the Vietnam War. It describes how Vietnam was divided in 1954 with US-backed South Vietnam and Soviet-backed North Vietnam. As fighting escalated, the US became increasingly involved through the 1960s due to the Domino Theory. Major events discussed include the Gulf of Tonkin Resolution of 1964, the Tet Offensive of 1968, and the fall of Saigon in 1975. It also examines the domestic anti-war movement in the US and the human costs of the war.