I've been thinking of this same thing from a few angles. Entry level: basic supplies that people need but often take for granted. Toilet paper and paper towel, textiles & clothing, shoes, containers, hand soaps, yard tools, replacement parts/tools, etc. Manufacturing some construction materials would help, since I feel there isn't enough competition here and supply is much smaller than demand. Custom cabinetry, doors & windows, roof shingles, siding, insulation, flooring, etc. Back on the smaller scale, there's simple robotics for residential consumers: hydroponics, animal feeders, automatic door openers, environmental control, motorized shades/blinds, even smart kitchen appliances. Basically, things you'd think of that only rich people could afford, but manufactured in a way that middle class folks could afford (or at least have access too when china shuts down again). Then there's security products: door locks, automobile anti-theft, property surveillance, intrusion detection and alarming, etc. But the stuff that really matters to me is low level electronic manufacturing: PCB etching, part stuffing, and especially integrated circuit using silicon and lithography. I'm not talking about competing with the likes of Intel, but establishing even tiny-scale IC fabricators in local regions would help the embedded system world depend less on china.