Are you sure that's not old info? I know there used to be major differences (which was obvious if you watched World Rally back in the day, since you couldn't get one of those Ford Focus models in the US), but I had heard they were consolidating some, so looked it up. According to Wikipedia[1], about a decade ago Ford started consolidating it's US and UK models, and now I think maybe beyond a couple variations only being available in one are, they are mostly the same. (It also notes they closed 3 of their factories in Europe). For the Focus specifically, they unified the models in 2011[2].
That said, even if Ford is or was building European specific versions in Europe, I wouldn't consider that any more a UK car company and less a US car company that I would consider Honda and Toyota any less Japanese car companies and more US even through they have many plants in the US and significant portions of their cars and materials are built here to get around import tariffs. They have significant portions of their companies housed here, and US divisions doing R&D in some cases, but those are definitely Japanese companies.
1: https://en.wikipedia.org/wiki/Ford_of_Europe#2011%E2%80%93pr...
2: https://en.wikipedia.org/wiki/Ford_Focus#Third_generation_(C...