To be fair UK history is also many nation's history, including the US.
Honestly people should be shamed for not knowing about Abe's Odyssey
I'm from the UK, which definitely did not try its hardest to make the world revolve around it.
Clearly Liam just confused The Odyssey for Ulysses, and assumed Ulysses was about Ulysses S. Grant, easy mistake
I find it a bit weird you haven't at least heard of the Odyssey by cultural osmosis. I've never technically read it but I like know the basic points of the story.
pretty much anyone who's ESL would not hear it through osmosis
If you said "non-westerners" to mean countries which don't think of themselves as rooted is Greek and then Roman cultural history, then yeah I suppose. But any European country I would expect people to have learned it through osmosis.
I have a feeling Liam's teachers tried a lot harder than everyone who has ever talked to Liam assumes.