I know there are PCB manufacturers somewhere in the US. I don't know about packaging. Do you know which firms do packaging of the dies and why can't the US do it(It can't just be cost)? How hard can it be really? Its essentially plastic , maybe some metal, and gold isn't it? Maybe an argument could be made to locate at least one source of manufacturing for all these steps in a local area. But thats just the programmer in me wanting to optimize without understanding the realities of manufacturing costs.