Field Trip: Cry Freedom The Harriet Tubman Underground Railroad Visitor's Center opens March 11.

At some hazy point in the not-too-distant future, Harriet Tubman—escaped slave, Underground Railroad conductor, Civil War spy/nurse/cook—will take up residence in your wallet by giving the heave-ho to ex-President Andrew Jackson on the front of the $20 bill. The federal government further honored Tubman by establishing the Harriet Tubman Underground …

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