Answer:
If i had to guess, id say 3, or c, because that's about money, and economics usually has to do something with money
Explanation:
Optimism was prevalent amongst immigrants because they were willing to take jobs that other Americans wouldn't and saw this as a form of opportunity.
The North achieve victory in the Civil War gaining an advantage over the South especially in terms of its military powers. Also, they had more manufacturing power producing more weapons than the latter and can transport goods faster.
Depopulation and they lost culture by moving. The languages transformed as well.
