Even if your boards are made in the US, aren't the machines they use made overseas anyway? Doesn't seem very scalable to me.

I have a friend who runs a short run contract manufacturing company in the US (prototype to 1000-ish runs). Needless to say he is fully dialed in to everything to do with the electronics supply chain. Even he sends out to China for prototype and short-run PCBs. He has tried multiple times with the few US-based companies that still do it, but quality and price are both issues, which is a bad combo.