The Vietnam War was a prolonged conflict from 1955 to 1975, primarily involving North Vietnam and its communist allies against South Vietnam and the United States. It marked a significant period of political tension, social upheaval, and military engagement that deeply influenced American society, culture, and foreign policy. This conflict sparked a generational divide, affecting youth culture and activism as well as shifting public opinion on U.S. military involvement overseas, especially in the wake of pivotal events like the Tet Offensive.