I really hate to say this but it's true, harbor freights sockets are just as good, if not better than the Craftsmen stuff currently available (in some cases) and they are CHEAP. I keep a full set in my car/yard box and they've never given me any trouble. I've even pounded on them with air tools (and I have good air tools) without any problems. The great thing about them, if you lose one, you can just about buy a whole new set on sale for the price of one Craftsman replacement.
As far as US made, while I haven't done any research lately, I'd have to speculate that maybe only top-end guys like Mac, Snap-On and the likes would be US made. Those brands are well made but STUPID expensive. The last time I checked (5 years ago) a 1/4" Snap-On ratchet, 3" extension and 6 sockets cost $415. For $415 you could outfit yourself with a complete HF tool set including the 5 roller drawer cart.