Question

what important question facing the united states following the civil war was just asked?
how would the states that left the union show their loyalty to the united states?
how was the nation going to pay to rebuild the plantations and property that was destroyed by war?
who was going to do the work to sustain the southern economy?
how will we punish those people who had been disloyal during the war?

Explanation:

After the U.S. Civil War, the core immediate question centered on reintegrating the seceded states, which required addressing how these states would demonstrate loyalty to rejoin the Union. The other options are secondary: rebuilding costs, southern labor, and punishment were not the primary foundational question compared to the loyalty and reintegration of the former Confederate states.

Answer:

How would the states that left the Union show their loyalty to the United States?