You are saying that we can't produce here anything past '50's technology?
How much would oil cost in your dream world? I guess we should emulate those countries that don't trade very much? Like Cuba and North Korea?
Is our governmental structure, economic system and political/societal setup like Cuba and North Korea? Oil would most likely cost less. Or necessity would create alternatives, much like eliminating border invaders that work for pennies in agriculture would force mechanistic solutions, making produce even cheaper.
You have no rationale for dependence on foreign trade, except possibly that you, personally, make money from it, so far, anyway.