John Oliver made an excellent point about Columbus Day, on Last Week Tonight, about why is Columbus Day still a Thing? He discusses how "some people with brains don’t celebrate it anymore. So America’s least favorite holiday commemorates a murderous, egomaniac who’s most famous discovery was a cast of getting lost and refusing to ask directions, all of which is enough to make you wonder— Columbus Day. How is this still a thing?” I don't remember being taught about the genocide that Columbus perpetuated. See the link above to see the video.