"An astonishing ninety-three plant species have been identified as integral to traditional life-ways in the region (the world population today depends on a handful of grains). It was this very richness that brought the Illinois in the first place; they’ve been traced back to the northern Ohio region in the 1500s and started settling the upper Illinois River Valley only in the 1600s."
Full article JSTOR https://daily.jstor.org/drought-and-indigenous-migration-in-the-american-midwest/
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