The Vietnam War caused immense loss of life and deeply divided American society. Over 50,000 US troops and millions of Vietnamese and Cambodians were killed in the long and unsuccessful US effort to contain communism in Southeast Asia. Growing public opposition led to major protests and political upheaval in the US. Ultimately, the US withdrew and South Vietnam fell to a North Vietnamese communist government in 1975. The war left a legacy of distrust in government and trauma for many veterans.