From Next Big Future:
In terms of the scale of the effort for colonizing North America, I think it is useful to compare the size of the naval fleets of the time and other historical benchmarks. We know how large the military is today and the share of the total economy that it has. It will be more useful to approximate how large the interplanetary space travel industry will need to be before an interstellar colonization expedition would be a reasonably sustainable activity.
This relates to the discussion of spaceships and whether interstellar spaceships will happen
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