What did the Fugitive slave act cause some abolitionists to do?

Passage of the Fugitive Slave Act made abolitionists all the more resolved to put an end to slavery. The Underground Railroad became more active, reaching its peak between 1850 and 1860. The act also brought the subject of slavery before the nation.

Explanation:

because it !

d.

the northwest territory became the most densely populated area in the u.s.