Why did popular sovereignty matter in the south?

Popular sovereignty was significant in the South because it allowed territories to decide for themselves whether to permit slavery, heightening tensions between pro-slavery and anti-slavery factions. This principle was seen as a way to maintain the balance of power between free and slave states, especially as new territories were being formed. It fueled conflicts such as "Bleeding Kansas," where violent confrontations erupted over the issue. Ultimately, popular sovereignty underscored the South's commitment to preserving and expanding the institution of slavery.