I think you’re creating a false dichotomy. Why get rid of Columbus Day?
I say we keep Columbus Day but we create a new Holiday called “Atonement Day”.
On the first Atonement Day we take a person who represents all that is wrong with Anglo-American culture and burn them at the stake in Atonement for our past sins (Just like the Shawnee burned Colonel Crawford) .
Obviously Watermark would be the best person to burn at the stake as I can think of no one better to represent the flaws of white Anglo Americans.
After that every Atonement Day everyone will display a picture of a Native American with a tear running down his cheek as a symbol of all the atrocities committed against Native Americans and for Watermark’s sacrifice.