The primary cause of unrest during the Vietnam War was the fierce opposition to U.S. military involvement in Vietnam, driven by concerns over the war's morality, high casualty rates, and its implications for civil rights and social justice in the United States. Many Americans, particularly young people and activists, viewed the conflict as an unjust war against a largely agrarian population, leading to widespread protests and demonstrations. The draft's selective nature also ignited resentment, as it disproportionately affected lower-income and marginalized communities. This unrest ultimately underscored a generational divide and culminated in a broader anti-war movement that persistently challenged U.S. foreign policy.