The only advise I would give on this angle is more that one should carry their passports (or some other form of ID) with them if they want to enter US bars / dr

The only advise I would give on this angle is more that one should carry their passports (or some other form of ID) with them if they want to enter US bars / drinking establishments or even just want to order a beer. The United States (from my perception) seems to have far more establishments serving alcohol, whose policy is to ask identification for everyone (or if not everyone, a ridiculously over-heavy subsection of their clients, eg "we check ID for anyone under 35"). Probably for CYA reasons. I don't ever recall any place in Europe asking for ID when buying a beer over in there (even when I visited when I was in my mid 20s). Whereas, I still occasionally get asked for ID in the United States in spite of being over 40.