What did congress pass to try and stop the violence against african americans and white republicans after the civil war?

There was a series of laws and amendments passed to give them their rights, and example would be:

The right to vote

The destruction of man being enslaved do to color of skin

Etc.

But of course this stuff kept going until the late 1800`s, but finally died down 

Um well north korea is a very harsh place because students go to school for 24 hours and almost never rest and the president is well i think sends to much bomb that’s what i think