You start chasing available game in Africa and end up in South America. Seriously, that's our lineage.

In a pre agrarian, pre sheparding society, all you could do is find things to eat since you couldn't create them yourself. Pastoralism made it possible to store the energy from natural resources in the form of animal meat, but that still required grazing your flock and moving to available grass and water. Even one person camping can strip an area of natural resources surprisingly quickly. It wasn't until the development of agriculture that people were able to stay in place long term.