It's an interesting theory, but as with all of these kind of theories, mostly conjecture. Crops are a cornerstone of human society, so it stands to reason that

It's an interesting theory, but as with all of these kind of theories, mostly conjecture. Crops are a cornerstone of human society, so it stands to reason that different crop types would after societies differently. I think this theory might be a factor in human development, but I think it would be a small one.