In the 1886, Martha Washington, the USA's first first lady, was featured on the face of the $1 silver certificate — a common form of U.S. currency then, backed the precious metal silver.

Pocahontas was featured on a $20 note issued in the mid-1800s, but she wasn't portrayed in portrait style like Martha Washington's silver certificate and she was on the back of the note.

Harriet Tubman will be the third woman to appear on U.S. currency.

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