The Squatter Sovereign, the most prominent of the proslavery newspapers in Kansas Territory, is first published in Atchison, Kansas. It goes on to print some of the most inflammatory proslavery rhetoric in the territory, before ironically being purchased by the antislavery Samuel C. Pomeroy in March 1857. Pomeroy, an affiliate of the Massachusetts Emigrant Aid Society, turns the paper in favor of the Free-State cause before reselling it to John A. Martin, who renames it Freedom's Champion.