The Vietnam War began in 1954 after France withdrew from Vietnam and the country was divided between a communist North Vietnam and non-communist South Vietnam. The United States became increasingly involved over the following decades by sending advisors, troops, and conducting extensive bombing campaigns to prevent the spread of communism. However, the US struggled to defeat the Vietnamese guerilla fighters and faced growing domestic opposition to the war. Despite temporary gains, the US was unable to achieve victory and withdrew from Vietnam in 1973. This ultimately led to the fall of South Vietnam to North Vietnamese forces in 1975.