Because it meant that they wouldn’t have to fight with the south. It was also because slaves picking cotton in the south helped businesses make money in the North
Frances Scott Key wrote the wrote the lyrics of the song Star-Spangled Banner
A. because they had to dig terraces into the mountain side which helped a lot with farming.
The manufacturing industry is a really important sector in the United States as it helped build the middle class after the second World War. In the early 21st century accounted for 10% of corporate profits. Unfortunately the employment in this sector is estimated to decline in the coming years.
It did not lead to the Civil War, what led to the civil war was the war of 1812. That was when U.S.A recognized that it needed to become stronger, and slaves were transported to the United States and put in the working class under bad conditions. Child labor and prejudice began there as well.