First a little bit of history:
In 1899, the U.S. Mint issued a $5 silver note that features Hankupapa Lakota Chief Running Antelope. It remains the only paper currency that includes a Native American in the history of money in the United States:

The note is still available as a collector’s item on eBay, where it sells for anywhere between $500 to $10,000, depending on the day and on the quality of the bill. Over at Treasured Stocks, there’s a short biography about Running Antelope, along with the cringeworthy rumor that the chief was made to wear a Pawnee headdress rather than a Lakota one.

Now fast forward to 2016 and the government has passed a law to have all $100 U.S. Currency notes to depict a Native American on the front of the bill.