On October 12, 1492, Columbus made landfall in the new world. "New" to Europeans, that is. Sometimes, people object to the words "Columbus discovered America" because various humans, maybe descendants of Asians, were already living on the American continents. But I have recently discovered the movie "Still Alice". I didn't know about it before even though many other people, fans, cast, and others did.
Because Europeans had guns and tended to use them, some survivors of "indigenous" people have emphasized how their own ancestors suffered various insults, intrusions and worse once Europeans started arriving in the Americas. Because of the way we do things now, and because of our calendar, it will not be until Monday, that Columbus Day and Indigenous Peoples Day is officially noted.