I think about this stuff every day too, in addition to Rome. I'm not just saying that for laughs - self-sufficiency is not enough, your little tribe may enjoy freedom for awhile but sooner or later you'll be pillaged. You have to join forces to build a powerful nation like the Romans.
Building high-end computer chip factories here would be cool - I seriously looked into it when I was young - but holy shit it's expensive! And there are some in this country albeit under foreign ownership. Small electronics factories would be more realistic - PCB etching, SMD placement and baking, hand soldering and assembly. From there you could move up to manufacturing basic components, transistors, simple ICs, or vaccuum tubes and light bulbs, or electric motors and generators and such.
But we could do without high-end computers. We really need to make our own basic hand tools, machines, engines, vehicles, stoves, furnaces, fuel, etc, and military items. There are forces that will do anything to stop us from being prosperous and independent. Basically we need what we already have, and used to have, including government - it just needs to be run effectively, by us, for us - not outsiders.
It takes a little courage, care and work- but nothing a human life depends on requires a government... we repave our own roads, generate our own electricity, have our own telephone company and ISP on a fiber-optic network, grow our own food, brew our own beer, treat our own water (and just installed new water mains), have a grain mill in town, build our own houses, hell, we even have vineyards brewing wine, orchards and shrimp and reindeer farms. To bring in funny money, we manufacture doors, windows, equipment to safely clean up oil spills and superfund sites, archery equipment and advanced plastics. I'd like to start a domestic computer chip manufacturing plant here, but my worthless parents stole the seed capital, and the courts are dragging their feet making me whole so that I can start making plans to break ground- which honestly is going to cost the entire region a lot, because I am fed up with the lies and delays and ready to move away, probably overseas to somewhere where innovation is still fucking "allowed." I can build another town that works the same, but I can't fix stupid or make drug-addicted retards stop being lazy whores because my old man thought shooting up and being on the nod in between fucking around with married women and wrecking homes was "muh gud life."
(And yes, we are 99.7% white- but I assure you, poor white trash is still a real problem.)
https://www.youtube.com/watch?v=B_BF9xvE90Q