The correct answer is the Utah territory. This was done as a compromise on allowing new states into the union. The states in the region actually did support slavery and the vote passed even though it had been previously forbidden. This was because it was in the south where slavery was a common thing.
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Cahokia was one of the largest and possibly the capital city of the people that are referred to as the Mound Builders. Cahokia's size and the large number of people that lived there led to the main issues. Bad droughts and poor harvests meant people couldn't eat.
The main way in which sermons differ from those of more traditional ministers is that sermons provide more of a "lecture," and speak to a specific topic that the minister feels is important.
I think it is the United States Office of War. Hope it helps!