What factors conspired to propel the united states to emerge as a military and economic powerhouse prior to world war ii?

Explanation:

Based on my research World War II took place between Sep 1, 1939 – Sep 2, 1945. During the 1930's (1929-1939) The United States of America was in the middle of the great depression after the stock markets crashed leading to worst economic crash in history. Therefore they were not a military or economic powerhouse at that point. Things started to change with WWII , when the government re-purposed factories to make war supplies thus giving millions of people jobs overnight and restoring the economy.

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