Today most human consume wheat, rice, and to a less extent potato as the main carbohydrate source, even though there are other carbohydrate sources too (corn, barley, tapioca, etc). Why is that so?
Are wheat and rice easier to plant at a large scale? Or is it because the ancient societies which loved wheat or rice became the most powerful ones and became the trend setters?
Or maybe a mix of these two? I am not surprised if ancient societies which had a steady and large supply of carbohydrate would eventually become powerful.