What cause range wars to happen?

Answer 1

Strangely, range wars are not over water rights. So, what are they about? It is between environmental outlaws who want to kick off ranchers who have worked on that land for over a century to raise cattle and sheep, and need it to survive. Another strange fact is that the preferred weapons weren't guns or bombs, but, the lawsuit.

OK so I am only twelve and that is all I know, but I hope that it helped.