Why were written laws needed as early societies became larger and more complex?

To establish and maintain a sense of uniform order amongst the people

Explanation:

So, as societies grew in both population and in land occupation, it became harder to regulate the civil obligations of being a "good citizen." The earliest written "code of law" is Code of Hammurabi, which established the "eye for an eye, tooth for a tooth" as a law to follow for a peaceful society. The use of an established set of law's helped to create a universal understanding of what was expected to be followed by all men throughout a large area ruled by one "king" which also helped to unify those city-states under one identity. His codes also laid out the punishment for breaking said law so there would be no confusion or room of interpretation on consequences of actions.

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