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The U.K will be screwed - there would literally be nowhere to hide out from the hoard.

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The part about not being invadable isn't true. The British made a good try in 1812 and were stopped largely because they didn't control the Great Lakes. had Perry been defeated at Lake Eerie or Jackson been defeated at New Orleans, it is doubtful we would have gotten out of that one with our territory intact. The open land border to the south is a highway if invasion every day.

Note that those rivers work as supply lines for an invader quite well, the Civil War being a case in point.

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I'm not convinced.

The natural environment in what became the USA did not seem to stop Europeans from invading and subjugating the indigenous peoples.

US per capita energy production is not that high.

GDP growth? Liars do statistics!

The great Lakes are large, Lake Baikal contains more fresh water than all of them combined.

Much of the prime farmland will revert to grassland as the Ogallala Aquifer and fertilizer becomes unavailable.

Last and most critical, the population is too divided, we won't cooperate!

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