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I imagine the migrants would get paid by other migrants to build the hypothetical cities. That is the way literally every US city happened after all — well, migrants or their descendants.

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There's a bit of a chicken & egg problem there - if the immigrants come in a giant burst, they won't have any money to pay for new cities with.

Then why aren't the migrants doing that in the places they live now?

A significant fraction of the builders in the UK are Polish.

It's the people that make up a country

And the country itself

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