"It’s official: Secretary of the Treasury Jack Lew has announced that abolitionist Harriet Tubman will replace President Andrew Jackson on the $20 bill. And, while Jackson will still reportedly remain on the reverse side of the bill, the move is nonetheless a momentous one.
"Naturally there are many people who will complain about this decision, but since Tubman’s legacy leading slaves to freedom through the Underground Railroad is beyond reproach, these critics will most likely turn to defending Jackson. As a preemptive rebuttal to such arguments, here are the four reasons why Jackson needs to go:"
http://www.salon.com/2016/04/21/why_andrew_jackson_never_should_have_been_on_the_20_to_begin_with/