Yes, there is a good book about it, called “Mutual Aid: A Factor of Evolution”.

it is not just farming land that is valuable, sometimes there are good fishing spots and etc in scarce regions. However those are far rarer situations and usually there is plenty of food for everyone, but hard times also happen and then most animals and humans practice mutual aid. There is a good book about it, by Kropotkin, called Mutual aid. It isn’t long, I listened to the audio book.

Territorial disputes where only common after agriculture in humans, because territory wasn’t as important before as mutual aid.

There is a good yt channel talking about egalitarian societies in prehistory called What is Politics

You are assuming someone always has to be in power over someone else. Historically most communities where run without anyone in charge, but with direct democracies. It just became harder with bigger cities, because it was harder to communicate with everyone else. Perhaps we can change that with the Internet.