Stephen Douglas's theory of popular sovereignty led to

corrupted elections, violence, and political chaos.

peace agreements between the free-soilers and pro-slavery settlers.

the abolition of slavery in Nebraska and Kansas.

the death of Senator Charles Sumner of Massachusetts.

Stephen Douglas's theory of popular sovereignty led to corrupted elections, violence, and political chaos.

Explanation:

Stephen Douglas was a parliamentarian from Illinois, who stood for The Presidential elections against Abraham Lincoln but was defeated. He vested the power in the people's hands to decide on allowing or not allowing slavery in their territory, this is known as his theory of popular sovereignty.

However, due to the outbreak of civil war in 1861, the failure of the theory of popular sovereignty was evident.