denarreiahspen9463 denarreiahspen9463 03-11-2017 History contestada Political tensions and debates surrounded territorial expansion of the United States leading up to the Civil War because Question 3 options: any new states joining the Union could change the sectional balance (number of slave states vs. number of free states) in Congress. Mexico kept control of Texas States did not want to supply troops to new areas Many people disagreed with Manifest Destiny (westward expansion)