The concept of popular sovereignty led to violence in this stat as it voted Wheatley to become slavery state or free state.

Answer:
kansas
Explanation:
"self-determination was called popular sovereignty.
In Kansas, people on all sides of this controversial issue flooded the territory, trying to influence the vote in their favor.
Rival territorial governments, election fraud, and squabbles over land claims all contributed to the violence of this era"
nps