If you're saying John Hanson was a black man, that doesn't appear to be the case.
https://en.wikipedia.org/wiki/John_Hanson
There are two possible origins for this belief. The first is that Hanson's grandfather, another John Hanson, was an early English immigrant to Maryland; as was common at the time, he worked as an indentured servant on his arrival in the New World. In 1661, his first master, William Plumley, sold his contract to Edward Keene and recorded the contract with the court of Calvert County, Maryland; similar court records were also used to transfer title to land and slaves. But, in six years, the immigrant John had worked his way out of debt, and a few years afterwards had purchased his own small farm. There is no record that the grandfather was black, but if indentured servitude was confused with chattel slavery, it is easy to see where this belief would have appeared.
https://en.wikipedia.org/wiki/John_Hanson_%28myths%29
I think we've covered the "presidents before Washington" debate before, and I've already strayed from the question.
Here is some history (and interesting trivia) on the elusive two dollar bill, leading up to its re-issue in 1976:
So on 3 November, 1975, Secretary of the Treasury William Simon announced that on 13 April, 1976, the anniversary of Thomas Jefferson's birthday, the two-dollar bill would once again join the family of American currency. Because 1976 also happened to be the bicentennial of the birth of the United States, a special design was chosen. Jefferson was not dethroned in favour of Martin Luther King Jr or Susan B Anthony as some had suggested; however, Monticello was banished in favour of the famous John Trumbull painting of the signing of the Declaration of Independence.
http://www.bbc.co.uk/dna/h2g2/A30652445
