I recently bought a LuK slave cyl, I was at first annoyed to see it was made in China, but on close inspection it appears to be made to a very high standard.
Conversely, I have seen North American made parts that are pure garbage.
My last set of Moog parts came from Indonesia. I don't know how long it's been since they've "gone global" but I've noticed a sharp decline in overall quality of Federal-Mogul stuff in the last ten years.