There are no new, made in the USA components for the factory brakes that I'm aware of. New calipers and pistons are all made overseas and have been for some time regardless of brand. Same for the hoses unless you go steel braided, there may be a few of those that are made here but not all of them are for sure. Everything else will be re-manufactured stuff, and there's no guarantee that will be better regardless of where it was originally made, that'll depend on the rebuild and they're not all great.
Just have to check the pistons in the bores before you mount up the calipers and take/send them back if they aren't right, regardless of them being new or re-manufactured.
For the OP, sounds like the hose to me. Doesn't matter if it's new or not, brand new hoses sometimes come with defects and some people like to clamp hoses with vice-grips to change calipers and that can total a hose with one shot. It could also be a damaged hard line, so take a look at the metal lines too. A crimp in the line could act like that as well. The brake releasing after it sits for awhile suggests that the fluid is leaking back to the m/c over time, that sounds exactly like some kind of hose restriction. The piston hanging up is less likely to resolve on its own while sitting.
If it were a master cylinder or booster issue it wouldn't just be one wheel. There could be multiple issues of course, but the caliper hanging on one wheel isn't likely to be a m/c. If it were both fronts that's a different story.
