Well because of the great depression many factories were just lying around not producing anything but when the us as attacked by japan almost immediately those factories were up and running to make war supplies and they needed workers so almost no unemployment in the us and everyone was making money.
b) Steam locomotive
Peter Cooper was an American industrialist, inventor and philanthropist. He designed and built the first American steam locomotive, the Tom Thumb in 1830. And he did it at the time when the lack of waterways in certain areas required new form of transportation.
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<span>Interstate Commerce Commission I would say!
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