This document provides an overview of the key events and factors that led to the United States' failure in the Vietnam War between 1950-1975. It discusses the escalating US financial and military commitment despite failing to achieve victory. Key events summarized include the Geneva Accords that divided Vietnam, the rise of Ngo Dinh Diem and conflict between North and South, the growing insurgency of the Viet Cong, the Gulf of Tonkin Resolution that expanded US involvement under Presidents Kennedy and Johnson, and the Tet Offensive that turned US public opinion against the war before the final defeat and withdrawal under President Nixon in 1975.