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North Vietnamese captured Saigon, South Vietnam's capital. They renamed the city Ho Chi Minh City.
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Nixon increased air strikes against North Vietnam and began secretly bombing Vietcong. Neighboring Cambodia.
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Nixon had announced that American troops had invaded Cambodia to destroy Vietcong bases.
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Ohio National Guard soldiers armed with tear gases and rifles killing four students at Kent State University
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To force North Vietnam to resume negotiations, Nixon ordered Christmas Bombing.
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The Congress passed the War Powers Act as a way to reestablish some limits on executive power.
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The warring sides signed an agreement "ending the war and restoring peace in Vietnam."
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The peace did not last. Cambodia fell under the control of the communist group the Khmer Rouge.
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In March 1975, North Vietnamese army invaded South Vietnam.
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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.