Anti-slavery crusader Harriet Tubman will become the first African-American on the face of U.S. paper currency, and the first woman in more than a century, when she replaces former President Andrew Jackson on the $20 bill.The U.S. Treasury Department said on Wednesday thatTubman, who was born into slavery in the early 1820s and went onto help hundreds of slaves escape, would take the center spot onthe bill, while Jackson, a slave owner, would move to the back.Introduced alongside a slew of changes to the $5 and $10notes as well, the redesign gives the Treasury "a chance to openthe aperture to reflect more of America's history," TreasurySecretary Jack Lew said.A new $10 bill will add images of five female leaders of thewomen's suffrage movement, including Sojourner Truth andElizabeth Cady Stanton, to the back, while keeping foundingfather Alexander Hamilton on the front.The reverse of a new $5 note will show former first ladyEleanor Roosevelt and civil rights leader Martin Luther KingJr., officials said. Former President Abraham Lincoln willremain on the front.Lew said the designs should be unveiled by 2020 and go intocirculation "as quickly as possible," although he declined tosay when. He said the $10 bill was scheduled to go out first,citing security needs.The long-awaited decision to replace the seventh presidentof the United States with Tubman followed months of outreach bythe Treasury regarding which woman should be featured on a bill.The debate began when the Treasury announced plans in Juneto feature a woman on the $10 note, prompted partly by a younggirl's letter to President Barack Obama that criticized the lackof women on U.S. currency and a social media campaign last yearcalled "Women on 20s."A MUSICALHamilton's growing celebrity status, due largely to aPulitzer Prize-winning Broadway musical about his life,"Hamilton," created by Lin-Manuel Miranda, propelled an effortto keep the first U.S. Treasury secretary on the $10 note and toreplace Jackson on the $20 bill instead.Jackson, a hero of the War of 1812's Battle of New Orleans,was president from 1829-1837. But he has been criticized for histreatment of American Indians and ownership of slaves.After considering hundreds of candidates, Lew said Tubmanwas chosen for her leadership and work helping others."It's the essential story of American democracy about howone person who grew up in slavery, never had the benefit oflearning how to read or write, could change the course ofhistory," he said.Tubman grew up working on a Maryland plantation and escapedin her late 20s. She returned to the South to help hundreds ofblack slaves to freedom and worked as a Union spy during theCivil War. She died in 1913.Women have not been depicted on U.S. bills since MarthaWashington, who was on the $1 silver certificate from 1891 to1896, and Pocahontas, who was in a group picture on the $20 billfrom 1865 to 1869.On coins, Sacagawea, a Native American who assisted theLewis and Clark Expedition, is featured on the gold dollar, andsuffragist Susan B. Anthony is on the silver dollar. Deaf-blindauthor and activist Helen Keller is on the back of the Alabamaquarter.Tubman became the top-trending hashtag on Twitter shortlyafter the news broke on Wednesday, with more than 100,000 tweetsand mentions online.Democratic presidential candidate Hillary Clinton, who iscampaigning to become the first female U.S. president, praisedTubman as "a woman, a leader, and a freedom fighter" on Twitterand said she could not think of a better choice.Some Twitter users applauded Treasury's decision to keepHamilton on the $10 bill.Actress Mara Wilson (@MaraWritesStuff) tweeted at Miranda,the "Hamilton" creator, saying: "@Lin_Manuel First you win aPulitzer, now you're affecting US currency. Get some rest!"