Guitars are seldomly made in the USA nowadays, since most guitar manufacturers have moved their factories over to the far-east, like China and Korea. The ones that still are made in the US, like Gibson, are out of reach for most guitarists.
Here is an interesting video on how guitars are made in China, enjoy:
There is no lesson to be learned from this video, it's just interesting to see the ahnd-made mass production work being carried out on hundreds, if not thousands of guitars. It's also interesting to see that all of the guitar are still hand-made, I would have thought that most of the processes we see on the video would have been mechanized nowadays.