Answer:
Hunting buffalo and farming
The people migrated because they were always searching for food like fruit and vegetables, and they were always following game that they would hunt.
I would say that authoritarianism is prevented in this case.
Authoritarianism means that there is only one person deciding what is right or what is wrong, according to their own thoughts and ideas. Nobody else has a say in a such an organization. However, here, that is obviously not the case, which is why that is prevented when a lot of people express their own opinions.
It's call a constitution. In the United States, for example, the constitution is called the Constitution, which is the second constitution US have drafted, after the first Articles of Confederations didn't work.
