Obama has stated he wants more diversity on US currency - hence the change. Andrew Jackson owned slaves as well so those campaigning for a move for the past few years wanted him replaced. Someone it then turned to replacing Hamilton on the $10 but now we're back to the $20. The whole thing seems unnecessary to me given all the other issues this country has.
George Washington and Thomas Jefferson owned slaves, too. Why aren't they being removed??
Time for the bad joke:
Is the Harriet Tubman $20 only worth $14?