Movimiento estudiantil
Opposition to the Vietnam War began in 1964 on United States college campuses. Student activism became a dominant theme among the baby boomers, growing to include many other demographic groups. Exemptions and deferments for the middle and upper classes resulted in the induction of a disproportionate number of poor, working-class, and minority registrants. Countercultural books such as MacBird by Barbara Garson and much of the counterculture music encouraged a spirit of non-conformism and anti-establishmentarianism. By 1968, the year after a large march to the United Nations in New York City and a large protest at the Pentagon were undertaken, a majority of people in the country opposed the war.