That would be nice but realistically the US doesn't have any sewing mills big enough to handle the business. It's one thing when you are a boutique manufacturer that has 5 guys sewing packs in the basement for a few dozen orders a month vs being able to produce enough packs to keep stock on the shelves of major retailers across the country. I'm sure they would have liked to keep everything made in the US but if you have orders to fill and there is nowhere left that can make your product you have to hire whomever you can.
Said differently: Mystery Ranch can't compete.