I was born and raised in Alaska, now live in the lower 48. I was just talking to my 5th grader about something random and she said, "Well that makes sense, Alaska is an island..." Wait, what?!?! We have definitely looked at world maps, maps of North America, and talked about the location of Alaska, but the prevalence of showing Alaska as an "island" in the middle of the Pacific on maps infiltrated her brain! I died a little as I had to explain it, both from my failure as an Alaskan and the failure of the public education system. When she looked at a map of North America, she was like, "Whoa! Alaska is really big!" Yes, darling, yes it is!
Don’t worry I’ve met grown ass adults who thought Alaska was an island, a different country, we all lived in igloos, or we all travel by dogsled. Atleast your kid has the excuse that they’re a child and don’t know any better.
Or the continental U.S. Last time I looked, we were on the North American continent, but I haven't looked at today's paper yet.