What help replace human and animal strength after the Civil War?

calvin taught his followers that human beings needed to follow strict rules to overcome their nature and do good. second choice

du boi was considered a radical because he wanted the immediate end for segregation. the biggest different between him and booker t. washington is that, even though washington believed that segregation should be considered illegal, he did not believe at all that a law was needed to keep blacks away from whites and that this would be something natural (to have the races apart) for a long time until society adjusted, while du boi believe that agitation was the only way to end segregation.

this question shoud be under spanish category, not