The Kansas-Nebraska Act was unpopular in northern states because

Ait furthered the Missouri Compromise
Bit could increase the number of slave states
Cit created a transcontinental railroad in the south
Dthe northern states disapproved of Stephen Douglas seeking southern

support

Eit weakened the infl uence of northern business interests

Verified Answer :

The Kansas-Nebraska Act was unpopular in northern states because "(B) it could increase the number of slave states," since it stated that the slavery issue in each new state would be decided by "popular sovereignty".