Who solved the problems caused by the great depression? or what solved the problems and what was the actions

While FDR’s New Deal programs helped to alleviate unemployment and stabilize banks, what ultimately revived America’s economy was WWII. The giant demand for military supplies and vehicles created new jobs and funneled in money, even before the U.S. entered the war because of the Lend-Lease Act.

sharp reductions in spending, taxes and regulation at the end of World War II

b is correct

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