This map should really have some dates on it. It might represent the state of things within, say, a 100 year period (or so) of European arrival, but it doesn't convey the history of humans in North America. I read the FAQ and could not find any information on what time period is represented here. If someone showed you a map of Europe or China marked out like this, it would be natural to ask "when is this?"

None of that does anything to ameliorate the genocide that was perpetrated against the people living in the Americans when europeans travelled and then settled here. But it's also important not to portray the prior 10k years or more of human settlement in the Americas as static and unchanging.