Answer: seceders

AnswerCrossword Clue
SECEDERSUnion leavers
SECEDERSConfederate States, e.g.
SECEDERSThe Confederate States of America
SECEDERSDropouts of a sort
SECEDERSThe South, in 1860-61
SECEDERSThe Carolinas in 1861, e.g.
secedersSECEDER, one who secedes (to withdraw formally from an alliance)