The year 1968 was marked by violent confrontations around the world. Protests against governments erupted from Mexico City to Paris to Tokyo, usually led by students in collaboration with workers. American society became increasingly polarized. On one side, the so-called hawks charged that the United States was fighting with one hand tied behind its back and called for intensification of the war. The doves wanted de-escalation or withdrawal. As U.S. troop strength neared half a million and military deaths approached 20,000 by the end of 1967, most people were torn between weariness with the war and a desire to fulfill the United States’ commitment. As one woman said, “I want to get out but I don’t want to give up.”

Grave doubts penetrated the administration itself. Secretary of Defense Robert McNamara, a principal architect of U.S. involvement, now believed that the North Vietnamese “won’t quit no matter how much bombing we do.” He feared for the image of the United States, “the world’s greatest superpower, killing or seriously injuring 1,000 noncombatants a week, while trying to pound a tiny, backward nation into submission on an issue whose merits are hotly disputed.” McNamara left the administration in early 1968 but did not publicly oppose the war.

A critical turning point came with the Tet Offensive. On January 30, 1968, the North Vietnamese and Vietcong launched a campaign of attacks on key cities, every major American base, and the U.S. Embassy in Saigon during Tet, the Vietnamese New Year holiday. Although the enemy lost ten times as many soldiers as ARVN and U.S. forces, Tet was psychologically devastating to the United States because it exposed the credibility gap between official statements and the war’s reality. Newsman Walter Cronkite wondered, “What the hell is going on? I thought we were winning the war.” The attacks created a million more South Vietnamese refugees as well as widespread destruction. Public approval of Johnson’s handling of the war dropped to 26 percent.

In the aftermath of Tet, Johnson conferred with advisers in the Defense Department and an unofficial group of foreign policy experts who had been key architects of Cold War policies since the 1940s. Dean Acheson, Truman’s secretary of state, summarized their conclusion: “We can no longer do the job we set out to do in the time we have left and we must begin to take steps to disengage.”

On March 31, 1968, Johnson announced that the United States would sharply curtail its bombing of North Vietnam and that he was prepared to begin peace talks. He added the stunning declaration that he would not run for reelection. Thus, military strategy shifted from “Americanization” to “Vietnamization” of the war. But this was not a shift in policy. The goal remained a non-Communist South Vietnam; the United States would simply rely more heavily on the South Vietnamese to achieve it.

Negotiations began in Paris in May 1968. The United States would not agree to recognize the National Liberation Front, to a coalition government, or to American withdrawal. The North Vietnamese would agree to nothing less. Although the talks continued, so did the fighting.

Meanwhile, violence escalated at home. Protests struck two hundred college campuses in the spring of 1968. In the bloodiest action, students occupied buildings at Columbia University in New York City, condemning the university’s war-related research and its treatment of African Americans. When negotiations failed, university officials called in the city police, who cleared the buildings, injuring scores of demonstrators and arresting hundreds. An ensuing student strike prematurely ended the academic year.