In the mid 1800s, the specific network of route and safe house use by people ecaping slavery was know as

underground railroad

Explanation:

The Underground Railroad.

Explanation:

It was well-known -- well, as well known as it can be since it's was sort of a secret -- throughout the African-American slaves in the 19th century. The Underground Railroad was used as a means to escape from slavery in the South into free states and Canada.

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