First American pope elected and will be known as Pope Leo XIV

Many Italian newspapers (example: IlPost) and, I suspect, many non-US media, report this as “the second American Pope, the first from the USA.”

Which, I think, is fair, as South and Latin are also America. And so is Canada. And so was Francis.

But I usually find it a hard concept to convey to my fellow local USsians.

>to my fellow local USsians.

I think you illustrated why the concept exists. USA actually has "America" in its name, unlike others - hence 'Americans' and not 'USsians'.