Why did the south support the dred Scott decision?

The South supported the Dred Scott decision because it reinforced the institution of slavery and affirmed the rights of slave owners. The ruling declared that African Americans could not be considered citizens and that Congress had no authority to prohibit slavery in the territories. This decision bolstered the South's political and economic interests by protecting the expansion of slavery, which was integral to its agrarian economy. Additionally, it heightened tensions with the North, further entrenching sectional divides.