Answer: I am pretty sure it was the Eastern front. I hope this helps.
Answer:
A. The demand rises while the supply falls.
Explanation:
When demand rises people want more of a product, but if the amount of that product (supply) is low it's more difficult to acquire said product, making it more expensive.
Northerners lost interest in the Reconstruction era because the Northerners got tired of trying to help fix the South's social problems and the Northerners wanted to start working on fixing their own social problems.
Hope this helps!
Answer is [happened before the present day].