Why did the neolithic revolution make government more important?

Neolitihic revolution refers to  the revolution that transform mankind's lifestyle from hunting/gathering into agricultural.
In an agricultural society, each member need to coordinate with one another in order to determine land's ownership and trading regulations. 
Because of this, a mediator such as government is needed in order to make everything fair.

From the moment Joe Biden steps outside of the armored presidential limousine known as “The Beast,” countless cameras document the President’s every move. But only one photographer can sit across from Biden inside of the car and capture him in his quiet, unguarded moments.

Adam Schultz, the new chief official White House photographer, is in the Oval Office, aboard Air Force One and in the Situation Room. He’s with the President for high-level meetings, but also when Biden pets his two German shepherds or throws a log on the fire in the Oval Office.