Thagrastay, you're forgetting one important factor, respectfully. There is no technology in the world that could properly and quickly dispose of all the sewage 6 billion people squeezed into Oregon would create. Sanititation in general would be impossible to maintain.
Then there's public transportation (as private transportation would be impossible), crime, water drainage, electricity, and a few other things I'm probably forgetting. There's more to it than sheer food production and square footage of habitable space.
Sure, we can probably feed billions of more people, but our societal infrastructure does not progress at nearly the level of our food-producing technologies. We're still mired in bitter arguments over welfare, drug legalization, prostitution, social security, federal subsidies. Cities are commonly a morass of civil entaglements that manage to trudge along through force of human will rather than gadetry or sociological breakthroughs. If you think you and I would be able to have widlly differing opinions in close quarters for an extended period of time, one needs to look no further than Palestine for a rebuttal to that argument.
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"The idea that money doesn't buy you happiness is a lie put about by the rich, to stop the poor from killing them." -- Michael Caine
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