Harriet Tubman would be the first woman to be honored on paper currency since Martha Washington’s portrait briefly graced the $1 silver certificate in the late 19th century. Tubman was a former slave and abolitionist who helped rescue slaves in the late 1800s.
A must read---
http://www.nytimes.com/2016/04/21/us/women-currency-treasury-harriet-tubman.html
