The answer is black freedman who left the south to seek opportunity in kansas
Answer: C. It forced them to support the recapture of escaped enslaved persons.
Explanation: The North was in heavy opposition to slavery. The Fugitive slave act made it so that any escaped slave ( whether they were in a free state or not) could be captured and returned into slavery, when beforehand if a slave entered a free state they were free.
I really hope this helps!