Here you go: https://pmc.ncbi.nlm.nih.gov/articles/PMC12846917/

868 worldwide cultures studied btw. For the majority, grain farming emerges with state formation—the two are inextricably linked. And for most of the others the fledgling state quickly adopts grain farming to feed itself, which forms the basis for the organization of the state.

It’s true that the seed of the state is a group of armed people threatening the rest into paying them a tribute. But without organized farming, groups like this quickly degenerate into roving bandit gangs. It’s not the core of the system, the organizing principle.

A canonical example is the Chinese Xia period, generally considered to be the initial period of state formation in China. Chinese state formation accompanied large scale projects to dam rivers, which controlled floods while providing irrigation for intensive agriculture. Complex organization and resource allocation was required to navigate this process. Before this period, there were warlords and armies, but no known organized states.

On the topic of violence—states can dish out violence on a scale far surpassing that of individuals or small groups. Industrial militaries and nuclear weapons multiply this potential. All of the largest slaughters in history were wrought by states. Ignoring this is willful blindness. States are not these wonderful things that prevent violence, they just redirect and reshape the violence. Humans are violent, with or without states.