President Nixon, at a news conference, defends the U.S. troop movement into Cambodia, saying the operation would provide six to eight months of time for training South Vietnamese forces and thus would shorten the war for Americans. Nixon reaffirmed his promise to withdraw 150,000 American soldiers by the following spring. […]

Hundreds of colleges and universities across the nation shut down as thousands of students join a nationwide campus protest. Governor Ronald Reagan closed down the entire California university and college system until May 11, which affected more than 280,000 students on 28 campuses. Elsewhere, faculty and administrators joined students in […]

In Cambodia, a U.S. force captures Snoul, 20 miles from the tip of the “Fishhook” area (across the border from South Vietnam, 70 miles from Saigon). A squadron of nearly 100 tanks from the 11th Armored Cavalry Regiment and jet planes virtually leveled the village that had been held by […]

At Kent State University, 100 National Guardsmen fire their rifles into a group of students, killing four and wounding 11. This incident occurred in the aftermath of President Richard Nixon’s April 30 announcement that U.S. and South Vietnamese forces had been ordered to execute an “incursion” into Cambodia to destroy […]

American and South Vietnamese forces continue the attack into Cambodia that began on April 29. This limited “incursion” into Cambodia (as it was described by Richard Nixon) included 13 major ground operations to clear North Vietnamese sanctuaries 20 miles inside the Cambodian border. Some 50,000 South Vietnamese soldiers and 30,000 […]

U.S. and South Vietnamese forces launch a limited “incursion” into Cambodia. The campaign included 13 major ground operations to clear North Vietnamese sanctuaries 20 miles inside the Cambodian border. Some 50,000 South Vietnamese soldiers and 30,000 U.S. troops were involved, making it the largest operation of the war since Operation […]

President Richard Nixon gives his formal authorization to commit U.S. combat troops, in cooperation with South Vietnamese units, against communist troop sanctuaries in Cambodia. Secretary of State William Rogers and Secretary of Defense Melvin Laird, who had continually argued for a downsizing of the U.S. effort in Vietnam, were excluded […]

In a televised speech, President Nixon pledges to withdraw 150,000 more U.S. troops over the next year “based entirely on the progress” of the Vietnamization program. His program, which had first been announced in June 1969, included three parts. First, the United States would step up its effort to improve […]

As part of the third phase of U.S. troop withdrawals announced by President Nixon, the 1st Infantry Division departs Vietnam. One of the most distinguished units in the U.S. Army, the 1st Infantry Division was organized in May 1917 and served with distinction in both World War I and II. […]