Well, and it's not Andrew Jackson day...even in Nashville where he is quite loved.
I really think so many people in the US believe what they were taught in school, and have no idea that Columbus did not share Thanksgiving on the Pinta with Pocahantas. No clue. Even what they were taught in US History or Social Studies, they remember nothing and really don't care.
However,
In so many cases when people learn what actually happened, so many of them are horrified and get why it should not be a Federal Holiday.
We did not celebrate Calumbus day in Argentina. We celebrated Dia de la Raza which was a celebration of diversity.