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Daoist philosophers believed that geometry and mathematics
Underground Railroad
A secret network of routes and safe houses used in the 19th century to help enslaved African Americans escape to free states and Canada.
Harriet Tubman
An African American abolitionist, humanitarian, and during the American Civil War, a Union spy, renowned for her role in the Underground Railroad, leading enslaved people to freedom.
Free States
Refers to U.S. states that had abolished slavery before or by the end of the American Civil War.
Enslaved People's Efforts
The various ways in which people held in slavery resisted their condition and sought freedom, including revolts, escapes, and culture preservation.
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