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Immediately after world war ii, Roosevelt on June 22, 1944, this act, also known as the GI Bill, provided veterans of the Second World War funds for college education, unemployment insurance, and housing.
During the great depression, there was a huge number of unemployed and poor people and FDR managed to solve that crisis with the new deal. As he was solving it, world war 2 began and the country had to take part in that war. The United States became the richest country after the war because its economy and industry and infrastructure was not harmed unlike in other countries worldwide so they exported a lot and the standard of living skyrocketed.
World War ii caused the postwar boom and extreme expansion and economic prosperity of many nations in the following decades. It, however, also caused major destruction and devastation of many countries which weren't as lucky. An example of a country which had great gains in the postwar period is the US for example.
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