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North Korea invades South Korea and creates a war between both in 1950 (not a actual date) only actual year.
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The U.S. launches the first nuclear powered submarine, the Nautilus ( NO ACTUAL DATE, JUST YEAR)
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Fidel Castro installs the first communist regime in the Western Hemisphere. The U.S. breaks off diplomatic relations with them in 1961 (NOT ACTUAL DATE, ONLY ACTUAL YEAR!)
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U.S trained people plan to overthrow the Castro government in Cuba with an invasion at the "Bay of Pigs." This method fails badly. It was a embarrassment to the Kennedy administration. (No actual date,just year)
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Alazka and Hawaii become the 49th and 50 states of the United States.