In the mid-1800s, the specific network of routes and safe houses used by people escaping slavery was known as the fugitive slave act. the abolitionist movement. the transcontinental railroad. the underground railroad.

In the mid-1800s, the specific network of routes and safe houses used by people escaping slavery was known as the Underground Railroad. The last option provided is correct.

The Underground Railroad constituted a network of people, African American along with white, providing shelter and aid to escaped slaves from the South.

The Underground Railroad worked from the late 18th century to the Civil War.

other sources of text

explanation:

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2. a land bridge connected asia and north america thousands of years ago.

4. crossing the land bridge would have been simple for the first migrants.

5. people might have crossed a land bridge while hunting animals.