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.
An immigrant can become a permanent resident of the United States if they become a Green Card Holder. Good luck!
There has been a debate about border control. Donald Trump wants to take action through buidling a wall along the border but the democrats do not want this. This creates a policy gridlock, where no policy is passed due to each party not wanting the other party to get its way.
A. Florence, Italy was a city state in the 14th century.
