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snazzynewshoes t1_jd5k8uc wrote

Look at a map of the South American West cost. Notice all the rivers that run from the Andes to the ocean. The people on the ocean, fished. A bit farther up, folks grew cotton for the nets and other crops(some great feats of water engineering). When ya get into elevation, that's where ya get ALL those potato varieties. And the inhabitants knew which varieties grew in which micro-climate.

Wiki says potatoes were grown as early as 8K BCE. The inca didn't really flex their muscles until the 1400ish.