【正文】 r. Encouraged by the movement, Senator Eugene McCarthy announced in late 1967 that he was challenging Johnson in the 1968 Democratic primaries。 his later strong showing in New Hampshire was seen as a major defeat for Johnson and a repudiation of his war policies. The Johnson administration took numerous measures to the antiwar movement, most notably undertaking close surveillance and tarnishing its public image, sending speakers to campuses, and fostering prowar activity. Many administration officials felt foreign Communists were aiding and abetting the movement, despite the failure of both the Central Intelligence Agency and the FBI to uncover such support. In 1965, a majority of Americans supported . policies in Vietnam。 by the fall of 1967, only 35 percent did so. For the first time, more people thought . intervention in Vietnam had been a mistake than did not. Blacks and women were the most dovish social groups. Later research found that antiwar sentiment was inversely correlated with people39。s socioeconomic level. Many Americans also disliked antiwar protesters, and the movement was frequently denounced by media mentators, legislators, and other public figures. By 1968, faced with widespread public opposition to the war and troubling prospects in Vietnam, the Johnson administration halted the bombing of North Vietnam and stabilized the ground war. This policy reversal was the major turning point. . troop strength in Vietnam would crest at 543,000. The antiwar movement reached its zenith under President Richard M. .Nixon. In October 1969, more than 2 million people participated in Vietnam Moratorium protests across the country. The following month, over 500,000 demonstrated in Washington and 150,000 in San Francisco. Militant protest, mainly youthful, continued to spread, leading many Americans to wonder whether the war was worth a split society. And other forms of antiwar activity persisted. The Nixon administration took a host of measures to blunt the movement, mainly mobilizing supporters, smearing the movement, tracking it, withdrawing . troops from Vietnam, instituting a draft lottery, and eventually ending draft calls. Two longstanding problems continued to plague the antiwar movement. Many participants questioned its effectiveness, spawning dropouts, hindering the organization of protests and the maintenance of antiwar groups, and aggravating dissension over strategies and tactics. And infighting continued to sap energy, alienate activists, and hamper antiwar planning. The strife was fanned by the . government, but it was largely internally generated. In the spring of 1970, President Nixon39。s invasion of Cambodia and the Kent State shootings (followed by those at Jackson State) sparked the greatest display of campus protest in . history. A national student strike pletely shut down over 500 colleges and universities. Other Americans protested in cities across the country。 many lobbied White House officials and members of Congress. Over 100,000 demonstrated in Washington, despite only a week39。s prior notice. Senators John Sherman Cooper and Frank Church sponsored legislation (later passed) prohibiting funding of . ground forces and advisers in Cambodia. Many labor leaders spoke out for the first time, and bluecollar workers joined antiwar activities in unprecedented numbers. However, construction workers in New York assaulted a group of peaceful student demonstrators, and (with White House assistance) some union leaders organized proadministration rallies. Despite worsening internal divisions and a flagging movement, 500,000 people demonstrated against the war in Washington in April 1971. Vietnam Veterans Against the War also staged protests, and other demonstrators engaged in mass civil disobedience, prompting 12,000 arrests. The former Pentagon aide Daniel Ellsberg leaked the Pentagon Papers to the New York Times. Meanwhile, the morale and discipline of . soldiers in Vietnam was deteriorating seriously: drug abuse was rampant, bat refusals and racial strife were mounting, and some soldiers were even murdering their own officers. With . troops ing home, the antiwar movement gradually declined between 1971 and 1975. The many remaining activists protested continued . bombing, the plight of South Vietnamese political prisoners, and . funding of the war. The American movement against the Vietnam War was the most successful antiwar movement in . history. During the Johnson administration, it played a significant role in constraining the war and was a major factor in the administration39。s policy reversal in 1968. During the Nixon years, it hastened . troop withdrawals, continued to restrain the war, fed the deterioration in . troop morale and discipline (which provided additional impetus to . troop withdrawals), and promoted congressional legislation that severed . funds for the war. The movement also fostered aspects of the Watergate scandal, which ultimately played a significant role in ending the war by undermining Nixon39。s authority in Congress and thus his ability to continue the war. It gave rise to the infamous Huston Plan。 inspired Daniel Ellsberg, whose release of the Pentagon Papers led to the formation of the Plumbers。 and fed the Nixon administration39。s paranoia about its political enemies, which played a major part in concocting the Watergate breakin itself.from The Oxford Companion to American Military History. Copyright 169。 1999 by Oxford UP.