Final answer:
U.S. troops invaded Cambodia during the Vietnam War to disrupt military operations. College students responded with widespread protests and a historic student strike.
Explanation:
U.S. troops invaded Cambodia between 1969 and 1973 during the Vietnam War to disrupt North Vietnamese military operations and counter the Khmer Rouge. This invasion spilled over into Laos and Cambodia, enabling the Khmer Rouge's rise to power.
College students responded by erupting in protest after President Nixon announced the invasion on April 30, 1970. The protests escalated into the first general student strike in U.S. history, with over 1.5 million students closing down around 1,200 campuses.
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