I'm in the UK, and buy much of my stuff from the UK, some from Europe.
Wargames Atlantic is an interesting case - I think they are a US company, but I'm not entirely sure, and they seem to ship to multiple international 'hubs'. But I'm not sure I would have thought to tick a 'buy from the US' box on a survey for them.
The other much smaller US manufacturer I have bought from is Warmonger minis - but postage costs are a big challenge.