What if from the earliest days of civilisation, much more emphasis was made on breeding invertibrates, slugs, beatles lavae, etc?
Much of the world does eat food from these sources, but, for better or for worse, it is considered a fringe form of nutrition. What if instead large livestock and poultry became the fringe, and the majority got their protein from grubs and such?
What kind of mass agricultural establishments would be established to handle this? For one thing, there won't be any cowboys...