The U.S. federal government was supported by 20 mostly-Northern free states in which slavery already had been abolished, and by five slave states that became known as the border states.
Pemerintah federal Amerika Serikat (AS) didukung oleh dua puluh negara bagian, kebanyakan negara bagian bebas yang telah menghapus perbudakan dan lima negara bagian budak yang kelak dikenal sebagai negara bagian perbatasan.