The era of Congressional ("Radical") Reconstruction can be seen as a failure because

Responses
A it prevented Southern states from holding elections.it prevented Southern states from holding elections.
B it punished all people in the Southern states equally.it punished all people in the Southern states equally.
C it resulted in the severing of ties with former European allies.it resulted in the severing of ties with former European allies.
D it continued to allow former Confederates to hold most of the power.it continued to allow former Confederates to hold most of the power.
E it did not adequately protect former slaves from having their rights violated.

E) it did not adequately protect former slaves from having their rights violated.