What were the confederates able to do when they were they were elected into office?

The actual Confederate States of America was a repressive state devoted to white supremacy. The Confederates built an explicitly white-supremacist, pro-slavery, and antidemocratic nation-state, dedicated to the principle that all men are not created equal.

As Southern states applied for readmission to the Union, they were required to submit state constitutions that ratified the Thirteenth, Fourteenth, and Fifteenth Amendments. Grant also kept soldiers in the former Confederacy.:

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mass production/ assembly line production