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North Vietnamese captured Saigon, South Vietnam's capital. They renamed the city Ho Chi Minh City. -
Nixon increased air strikes against North Vietnam and began secretly bombing Vietcong. Neighboring Cambodia. -
Nixon had announced that American troops had invaded Cambodia to destroy Vietcong bases. -
Ohio National Guard soldiers armed with tear gases and rifles killing four students at Kent State University -
To force North Vietnam to resume negotiations, Nixon ordered Christmas Bombing. -
The Congress passed the War Powers Act as a way to reestablish some limits on executive power. -
The warring sides signed an agreement "ending the war and restoring peace in Vietnam." -
The peace did not last. Cambodia fell under the control of the communist group the Khmer Rouge. -
In March 1975, North Vietnamese army invaded South Vietnam. -
America paid a heavy price for its investments in Vietnam, far more than the estimated $173 billion in direct costs. About 58,000 young Americans died, and some 300,000 were injured. Estimated 1 million North Vietnamese and South Vietnamese soldiers died.