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> A major economic change sounds impossible, but we've done it in the US at least three times in the last century.

No.

Creating the Federal Reserve was a fundamental change. Confiscating gold then pegging the US dollar to a gold-backed value was a fundamental change. Getting rid of the gold standard and going full fiat sad a fundamental change.

The economic model, monetary policy, and incentives of each system were completely different. We may not have renamed the currency or the country, but that doesn't change the fact that those were major economic shifts.

That's the value of space colonization, or the hope and promise of space colonization -- Preservation on of the economy

That was true 200 years ago and maybe even 200.000 years ago. Some day there will be no more growth - but it could be another 200.000 years.