About 30 years ago I was friends with an American woman. She was well educated, worked in a senior non-medical role at a hospital.
Her ignorance of the world was astounding. Despite living only 20 miles from the Canada-US border, she thought that Canada was east of the US. She once asked me if London was near England.
She was under the impression that in WWII, the US was fighting alone against Russia and the Nazis, and... Germany was ... well, a sort of bystander.
In some ways, this is understandable. In general, you either learn something formally, or you pick it up through reading and the culture you live in. As far as I gather, the in-school teaching of history and geography is totally US-oriented. I was born in England, and history at school was England-oriented. If you asked me about Italian history, or Turkish history, I'd be pretty lost.
I also have the impression that for most Americans that non-Americans are are irrelevant to the point of almost being non-existent.
By the way, for context, two of my grandchildren are Americans.