Why did general oliver otis howard think the nation couldn’t let reconstruction fail

General Howard said that the Civil War was fought over the rights of former slaves. However, after the war, the former slaves were not guaranteed those rights. If blacks were going to be oppressed and treated badly, that would mean that Reconstruction had failed, and the war had been fought for nothing.

Explanation:

This is the sample answer from Edmentum-Clever.  I suggest changing a couple of words.  

1. explain aspects of the democratic process as it was developed in ancient athens

2. trace the roots of the americans political process to ancient athens

3. explain the relationship of citizens to the political process