The first year ever.
I'm Scandinavian descent - mostly - German/Austrian/Irish on my mother's side - which means I believe the Vikings were here first. Columbus discovered America for the Europeans. The Spanish brought the Gospel. Someone had to do that.
Indigenous people were already here - obviously they discovered the landmass first, and formed their own civilization - I have no problem with celebrating that. I also think it is important for us to understand the grave injustices done to indigenous peoples by Europeans and to acknowledge that.
Giving up Columbus Day doesn't change anything for me.