Also on point of the actual subject I saw someone mention putting the first female president on the 20$ if we were ever to elect one. We wouldn't really be able to do that because the law forbids any living person to be put on any of our money.
Aside from that, the first female president shouldn't go on the $20 bill simply because she was the first female president. That is a horrible reason to stick somebody on.
For all we know, the first female president could be a horrible person and be terrible at her job. Should she really be put on money simply because she was the first female president rather than for better reasons like "she was a fantastic person who did many brilliant things"?