On Wednesday, April 20, Treasury Secretary Jacob J. Lew announced that Harriet Tubman will replace Andrew Jackson, the seventh President of the United States, on the $20 bill. The former slave and abolitionist is the first African-American, and the first woman in over a century, to be featured on the face of U.S. currency. The last female represented on U.S. notes was Martha Washington, who appeared on the $1 silver certificate from 1886 to 1957, when the certificates were discontinued.