This was downvoted but I think they meant in Croatia, specifically, which seems like the right answer to me to the question why they're switching to EUR instead (correct me if I'm wrong)

Well, yeah, of course it got voted down, there's a lot of American Exceptionalism on here.

No-one outside the US uses US dollars. People from the US come to the UK, for example, and kick up a fuss because they can't pay for anything "but everyone accepts the dollar!" No, they don't.