The supply chains all being located in Asia is the first big hurdle to manufacturing elsewhere, then there is the technical deficit (engineers, skilled labor), and finally the cost of labor + regulatory compliance. I wish more was made in the USA too, but the best you're going to do if you want something built here now is a handmade steel frame with a hand built wheelset that has hoops and hubs that are still made in the USA (there are some).
Big picture though, most of the money you spend cycling stays right here even if your equipment was manufactured overseas. Most of the calories going in your body were grown here, the roads you ride on were built, and are maintained by American workers, the money you spend at cafes and such on rides supports those businesses. Bike shops and online retailers that mostly sell goods made overseas also employ people; in fact there is more added value (money) in the retail part than manufacturing.