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The Underground Railroad was the name of the escape routes used by slaves to escape the South and flee to the North. It was a network of special routes and safe houses that were used by both slaves and abolitionists who were sympathetic to their cause of escaping slavery. It started in the late 1700's and ended after the abolition of slavery. Canada was a popular destination, as slavery was prohibited their and had a longer border for easier access.
During Hoover's administration, the stock market collapsed. This was such a huge deal because people were borrowing money from the banks and putting in stock market. When the collapse occurred people were unable to repay the banks the money they took out, the banks failed.
the way United States maximize industrial output during the war was: It exempted some workers in wartime industries from the draft.
During the war, many men were obligated by law to contribute their service to the country. Those that are not physically capable to be a soldier tend to be exempted and required to contribute to other sectors of the war. One of them was as workers in war-related industries.