> like some of those American Indian tribes that tried and failed to build corn-based civilisations in pre-Columbian times Do you imply that corn had negative

> like some of those American Indian tribes that tried and failed to build corn-based civilisations in pre-Columbian times Do you imply that corn had negative effect on Indians? From what I've read [1] it actually allowed Indians to maintain their population levels without having irrigation technology comparable to one developed in middle East and Europe. [1] http://mitpress.mit.edu/books/technology-world-civilization http://mitpress.mit.edu/books/technology-world-civilization