What happened 5 days after the civil war ended?

during which the United States grappled with the challenges of reintegrating into the Union the states that had seceded and determining the legal status of African Americans.

Explanation:

Reconstruction. Reconstruction refers to the period immediately after the Civil War from 1865 to 1877 when several United States administrations sought to reconstruct society in the former Confederate states in particular by establishing and protecting the legal rights of the newly freed black population

After the civil war from 1865 and 1877 when several United states administration's sought to reconstruct society in the former Confederate states in particular by establishing and protecting the legal rights of the newly freed black population. I hope this was the answer you were looking for.

b. major john c. frémont led a rebellion called the bear flag revolt.

explanation:

during the bear flag revolt, from june to july 1846, a small group of american settlers in california rebelled against the mexican government and proclaimed california an independent republic. the republic was short-lived because soon after the bear flag was raised, the u.s. military began occupying california, which went on to join the union in 1850. the bear flag became the official state flag in 1911.

letter a is the answer