If nationality is not a problem, then I think you should do more research before you make any decisions. This is a UK-based, and UK-focussed forum. There isn't the depth of knowledge here that you need to get satisfactory answers to your questions. I don't have links to any similar bulletin boards in the US, though I've no doubt they exist.
It might be an idea, as a start, to contact our moderator 'Keygrip' (see the top of the forum contents page), as he's based in the US and may well have some useful contacts for you. The only school I can think of that is heavily involved in training specifically for the US airline market is Embury-Riddle University - you could take a look on their site to see an example of what you might need to do.
If you were to intend to train in the US and return to work in the EU, this is a well-trodden path. A read through just the last few days' topics will reveal many that relate to this route.
Scroggs