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  Pres.Kennedy had reports of soviet technicians and supplies arrivingin cuba
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  aerial surveillance revealed missiles in cuba
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  Pres.JFK addressed nation on soviet threat and announced a blockade of cuba
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  USSR warned the U.S. that actions could lead to nuclear war
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  Pres.Kennedy accepted Khrushchev's proposal to end the crisis
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  Khrushchev announced that weapons will be returned to the Soviet Union