Nationalism can unify a country by having a sense of superiority over other countries.
The North relied mostly on industry for income but the South was almost all agricultural. Without the slaves they didn't have many people left to work the land.
For financial and legal support
I"m not really sure but i think the answer is C.
I'm pretty sure the answer for this is:
C. A philosophy of government that advocates for a strong central government
Hope this helps! :D
