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The oil embargo of 1973 forced the U.S. to ration gasoline for a time.
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12 million Americans were sent into the military, and a similar number toiled in defense-related jobs. Those war<span> jobs seemingly took care of the 17 million unemployed in 1939.
So, a shortened answer would be:
When people left for the armed forces to fight, many job opportunities became available for the unemployed.
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The 3 purposes of Freedman's Bureau was to free slaves, provide free land, and help find employment.