Harriet Tubman will become the African-American to grace the U.S. currency $20 bill

Harriet Tubman will become the first woman on U.S. currency, Treasury Secretary Jack Lew announced on Wednesday. Tubman will replace Andrew Jackson, the nation's seventh president, on the $20 bill.

Tubman, who was born into slavery in the early part of the 19th century, escaped and then used the network of antislavery activists and safe houses known as the Underground Railroad to transport other slaves to freedom. After the Civil War, Tubman, who died in 1913, became active in the campaign for women's suffrage. 

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