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draconianRegiment t1_jd9rvgf wrote

There's an oversimplified video or two about this on YouTube.

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Joy1312 t1_jd9tkyq wrote

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PrezMoocow t1_jdbh6sn wrote

Straight line?

Straight line

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SuspiciouslyElven t1_jdcgybw wrote

To be fair, a third of the continent looks like this. Not many natural boundaries to fight over, y'know?

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Accomplished_Job_225 t1_jddirq0 wrote

The drainage basin heights of land or one of the east west rivers like the Missouri, Assiniboine, Souris, Qu'apple Rivers might have worked.

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