Answer:
Democrats and Southern Democrats
Step-by-step explanation:
Popular Sovereignty is the principle that defends that the authority and its government are created and sustained by the consent of people. In the US, Democrats mostly defended popular sovereignty as a way to solve the slavery issue.
In the Lincoln-Douglas Debates of 1858, Abraham Lincoln criticized popular sovereignty because it was a weak system since people could move the voting up or down by moving into the territories and voting there.