The <span>movement against the involvement of the United States in the Vietnam War</span>
began in the U.S. with demonstrations in 1964 and grew in strength in
later years. The U.S. became polarized between those who advocated
continued involvement in Vietnam and those who wanted peace.
Many in the peace movement were students, mothers, or anti-establishment hippies.
Opposition grew with participation by the African-American civil
rights, women's liberation, and Chicago movements, and sectors of
organized labor. Additional involvement came from many other groups,
including educators, clergy, academics, journalists, lawyers, physicians
(such as Benjamin Spock), Civil Rights Movement leaders and military veterans. Opposition consisted mainly of peaceful, nonviolent
events; few events were deliberately provocative and violent. In some
cases, police used violent tactics against demonstrators. By 1967,
according to Gallup Polls,
an increasing majority of Americans considered US military involvement
in Vietnam to be a mistake, echoed decades later by the then head of
American war planning, former U.S. Secretary of Defense Robert McNamara.
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