What challenges did the United States face after the Civil War ended? Check all that apply.

The future of more than four million formerly enslaved people was unknown.

The industrial economy of the North was failing.

The country needed to be reunified.

The costly war had resulted in debt.

Southern farmland and infrastructure were devastated.

A, C, D and E

Explanation:

the federal constitution of the united mexican states of 1824 was enacted on october 4 of 1824, after the overthrow of the mexican empire of agustin de iturbide. in the new constitution, the republic took the name of of united mexican states. it was replaced by the federal constitution of the united mexican states in 1857.