What happened to the underground railroad after the fugitive slave act was passed? it became less effective. it grew and became busier. it was shut down by slave hunters. it was shut down by the federal government.

After the Fugitive Slave Act was passed, the Underground Railroad grew and became busier.

Explanation:

The Underground Railroad was a clandestine network organized in the nineteenth century to help African-American slaves escape from the southern plantations to free states or Canada.

The Underground Railroad looked for its collaborators within the abolitionist movement, of which it was a part, and thus it continued to extend its activities always outside the law. It was especially important during the validity of the Fugitive Slave Act, helping the slaves not to be captured by the white supremacists of the southern states.

d.summerains, the last one

bismarck believed in using force

is the correct answer!