Which statement is a valid generalization about the experience of african americans during the early reconstruction period

https://www.history.com/topics/american-civil-war/reconstruction

the doctrine of nullification recommended that states living inside the union have the one-sided, inalienable ideal to void any law made by the national government that could be esteemed illegal.

the united states was shaped based on a general agreement among its individual states. hence, it is inferred that under the hypothesis of invalidation, since the states are the establishment of the union, they have the ability to referee and disprove unlawful laws.

c) troops march forward in close formation against newer, more accurate weapons