Answer:
depends on which war
the main answer if this is world war II would be excitement and prestige many young men wanted to go off and come home as heroes
Explanation:
I believe that one of the main reasons was that the North had a more industrialized advantage. For example, the North had many factories and railroad systems which was scarce farther South where agriculture and farming dominated. Having these factories allowed manufacturing weapons and suplies much easier and quicker than than the South.
The gold rush influenced the development of the west
