"No city, town, village, family unit, or no nation or vast empire in the history of humankind has had all the resources for survival in situ."

If this was true, human kind would've died out immediately. Come on. Trade originally was for unique or luxury items, not survival. There was a time when trade was either non-existent or minimal. Trade has evolved as we have become more specialized, and transport cheaper to have more global interdependence. But interdependence is something that started at zero, and was very low for most of the time man has been around.

Right now if all international trade was cut off from the US, would we all die? I think not. lol. This was almost too silly to respond to.

As far as your costs to orbit, who has gotten anywhere close to those prices to get off planet? No one is even projecting those prices with any currently conceived "real" technology (unless you consider the space elevator real--which you evidently don't).