Che cosa significa Perhaps those cycles of colonization, adaptation, and population explosion were what selected for the Great Leap Forward, which then diffused back westward to Eurasia and Africa. ?

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@Susu0210 You're right that it's not written well. If they eliminated the "for" (what selected the) it would probably work better... BUT


This is hard to edit because I'm not familiar enough with The Great Leap Forward, (to know the best way to write this). BUT the writing is pretty bad.

Tangent:
It reminds me of a college student trying to write "fancily", to sound more intellectual. It's a problem in academia. It sort of spreads in a group-affirming plague of "look how smart we are" for using fancy words that need decoding. (You might think I'm joking but this is a real problem, a few professors wrote fake articles with a lot of fancy words to see if they could get published, even though the words actually didn't mean anything, and they were repeatedly published!) Bottom line, sometimes it's not that you don't understand because you don't know enough English, but that no one understands unless they're faking it.
😲

Ok, sorry,.. Diffused = spread over a large area. So basically it spread westward (geographically, to places to the west of China).