In the 1860s, the issue of slavery took center stage, with disagreement in particular over the question of whether slavery should be permitted in the country's new territories in the West.
Pada dasawarsa 1850-an, isu perbudakan mengemuka, dengan ketidaksetujuan khususnya menyangkut pertanyaan tentang apakah perbudakan diizinkan di wilayah-wilayah barat negara ini.