Where did the rival pro-slavery and antislavery governments existed in?

Rival pro-slavery and antislavery governments existed primarily in Kansas during the mid-19th century, particularly during the period known as "Bleeding Kansas" (1854-1859). This conflict arose after the Kansas-Nebraska Act allowed settlers to determine the status of slavery in their territories, leading to violent confrontations between pro-slavery and anti-slavery factions. Additionally, similar tensions were evident in other border states like Missouri and in various debates throughout the United States as the nation grAppled with the issue of slavery.