Surely it's very similar, companies can't - AFAIK - be registered in USA, they're registered in a state. USA's States have different tax and legislative climates, just like EU states do.
Sure, but the U.S. are a single country, while Europe is many different countries that are completely different.
I'm in Poland and can drive 2 hours and stop understanding what people are saying to me (in German and Czech).
That was my point.
It's not. Part of Russia is in Europe. The geographical limit between Europe and Asia is not well defined.
I think it would be similar to saying "First American chat app that...", which would be ambiguous?