During the civil war, the north faced economic problems,
a. high unemployment and low wages.
b. massive debt and a rise in inflation.
c. a complete overhaul of its economy.
d. the need to replaced enslaved labor.

During the Civil War, the North faced economic problems, including "a. high unemployment and low wages," although they still outnumber the South, and their economy was overall more secure. 

Ifound this on google “simply, the working conditions were terrible during the industrial revolution. as factories were being built, businesses were in need of workers. with a long line of people willing to work, employers could set wages as low as they wanted because people were willing to do work as long as they got paid.” i hope this you for what your looking for.