Many, many more than you might expect. While its hard to pin down solid numbers, when the United States is divided up by GDP, we have the gross domestic product of Japan, China, Germany, and the UK combined. Yes, you read China in there, meaning we might be able to support as uch as 20 billion people in the US alone, if we built it up like Japan across the entire country, reserving a few stretches for pure farmland.
I hope this helped!
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