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The Korean War ended by having an armistice signed on July 27th, 1953.
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The main reason why the United States was so interested in the security of Latin America is because the Latin American countries were so close to the US, meaning that if they were invaded by European powers it would post a threat to the US.
The hessians main goal for winning the war was to "get paid by the British"--since they were hired mercenaries who had no real interest in American independence.
Albert Sabin came up with an oral polio vaccine in 1962