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With permission from Russia, North Korea invades South Korea and continues on to the capital of Seoul. South Korea does not have a strong enough army to stop it.
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Worried that South Koreans will join the communists, President Syngman Rhee starts the Summer of Terror and orders over 100,000 people killed.
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President Harry Truman sends U.S. troops to Korea. The U.S. and other countries in the United Nations join the war because they want to stop communism from spreading to South Korea.