What was the idea behind popular sovereignty in the mid-1800s?                 a.  allowing newly added territories to the united states to decide for themselves their own form of government      b.  allowing slaves the rights to own property and vote      c.  allowing newly added territories to the united states decide for themselves the slavery issue      d.  allowing all americans to vote for the president

The Correct Answer is C.

Explanation:

When America is getting mature, extra states are being added to the United States and the issue of Slavery becomes the major issue.During 1850 the problem of Slavery came through as another issue. California was becoming a state and wanted to be a free state without any slavery.States mainly Southern opposed this because if California becomes a slave-free state then there will be only 12 states left with slaves and there would be 13 slave-free states.This would mean the Free States have the majority than the Slave States.