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1950 North Korea and South Korea declare war after Northern forces stream south on June 25
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1951 H-Bomb is in the middle of its development as a nuclear weapon, announced in early 1950 and first tested in late 1952.
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1952 Rocky Marciano defeats Jersey Joe Walcott, becoming the world Heavyweight champion.
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1953 Communist bloc is a group of communist nations dominated by the Soviet Union at this time. Probably a reference to the Uprising of 1953 in East Germany.
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1954 Juan Perón spends his last full year as President of Argentina before a September 1955 coup
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1955 Elvis Presley signs with RCA Records on November 21, beginning his pop career.
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1956 Budapest is the site of the 1956 Hungarian Revolution.
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1957 Mickey Mantle is in the middle of his career as a famous New York Yankees outfielder and American League All-Star for the sixth year in a row.
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1958 Lebanon is engulfed in a political and religious crisis that eventually involves U.S. intervention.
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1959 Space Monkey: Able and Miss Baker return to Earth from space aboard the flight Jupiter AM-18.
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1960 U-2: An American U-2 spy plane piloted by Francis Gary Powers was shot down over the Soviet Union, causing the U-2 Crisis of 1960.