They were allowed to rejoin if they accepted the 13th amendment. It was one of the reconstruction amendments that ended slavery and gave led to African-Americans getting their voting rights and their freedom.If they wouldn't accept it they wouldn't be allowed back.
Answer:
To criticize how weak the USA president william McKinley was (To gain pulic favor)
Explanation:
Hope this helps
A. House of Representatives. It then goes to college so they can decide if they will remove him from office or not