-northerners passed personal liberty laws to combat the fugitive slave act angering southerners -the kansas-nebraska act nullified the missouri compromise and caused some northerners and southerners to set up anti slavery and pro slavery governments in kansas -nebraska territory broke into kansas and nebraska giving each other territory to allow or not allow slavery More test answers on https://studyhippo.com/chapter-3-the-union-in-crisis-1399/