The question is that who would arrive in the Late 1800's CSA.
I can't really think what states the CSA would own, but lets just say all of the Southern States, Kentucky, and New Mexican Territory.
However, barely any Russians, Germans, Dutch, Scandinavians came to the South during this time, Irish hardly too.
Could there be an event in the country that would cause many foreigners to sway the US Immigration into the south?