A mass antiwar rally follows the Cambodia incursion and Kent State killings

The National Assembly voted to remove Sihanouk while he was abroad, and Lon Nol took power. The change drew Cambodia deeper into regional conflict. Cambodian political actors and civilians had their...

Cambodia’s National Assembly removed Prince Norodom Sihanouk and Lon Nol assumed power. The change reshaped regional politics and preceded the U.S.-South Vietnamese incursion; Cambodian sovereignty...

A U.S. directive authorized the deployment of U.S. and South Vietnamese ground forces into Cambodia. The campaign widened the war into a formally neutral state and provoked intense opposition in the...

Nixon announced a cross-border ground incursion aimed at North Vietnamese and NLF base areas. The action broadened the war, provoked mass protests in the United States and led Congress to restrict...

National Guard troops fired on students during protests against the Cambodia incursion, killing Allison Krause, Jeffrey Miller, Sandra Scheuer and William Schroeder. The shootings intensified the...

Mississippi police and highway patrol officers fired into Alexander Hall during campus unrest, killing Phillip Gibbs and James Green and wounding others. The shootings followed Kent State but received...

Congress enacted restrictions on U.S. ground forces and advisers in Cambodia through the Cooper-Church amendment. The measure reflected legislative resistance to the expansion of the war and a renewed...

Operation Lam Sơn 719 sent South Vietnamese forces into Laos to disrupt supply routes, with U.S. air support but no U.S. ground combat units. The operation suffered major losses and demonstrated the...

South Vietnamese ground forces crossed into Laos with U.S. air and logistical support, seeking to disrupt the Hồ Chí Minh Trail. The operation tested Vietnamization and Laos’s sovereignty; Laotian...

South Vietnamese forces withdrew from Laos after heavy losses. The operation failed to permanently sever supply routes and exposed the limits of U.S. claims that Vietnamization could sustain major...