It is B. Representative Democracy
I believe the answer is "termination".
The Kansas Nebraska Act of 1854 shattered whatever peace was gained by the Compromise of 1850. In addition to organizing the U.S. Territories of Kansas and Nebraska, the act attempted to deal with the extension of slavery into this region by allowing the settlers in each territory to decide the question for themselves. Hope That Helped
They were interested for two reasons , they were in a power battle where they both wanted to be more powerful , as a result of this they both wanted to have influence over as many places as possible. The other reason is that having influence over certain places can give powerful allies which means in the worst case scenario they have more people on their side. Hope this helped :)
