How did hieroglyphs help unify centralize power in early societies?

It turns out that most hieroglyphs depicted transactions...how many baskets of grain, etc...ordinary business transactions but the recording of these transactions was an extremely powerful tool to organize and to 'control" people and trade goods. Of course some hieroglyphs depicted actual events but the bulk of them turned out to be simply...ledgers. And the people who could count, keep track of, and organize food and other trade goods held the keys to power in this time period. Clay tablets have held up better than any other form of writing...if they were not crushed, they last a long, long, time, longer than papyrus or knots in rope (another method of counting and keeping track of goods). They also made a lot of these clay tablets for practice so that is also why we have so many to study today.It takes a lot of food to be able to have people live in cities...they are not on the farms producing food, so in order to have cities, there must be a really really good system of growing food, transporting it, storing it, and finally, keeping track of the transactions involved. These more complicated measures were and are the key to having cities, indeed, the Industrial revolution (ongoing) started in England because they could grow more food. Everything humans have done led up to how we produce, store, move and sell food and other goods even today. And when you hold the tools, like hieroglyphs, you hold power. I am not sure that Egypt had ALL the power centralized, but it was more centralized than before by the use of hieroglyphs. I am pretty sure there was still power held by the dynasty AND by the priest/priestesses...not centralized in one place yet.

If you mean written language then code of law was first written down on akkadien tablets in the fertile crescent; hammurabes code. I don't know how law was in ancient egypt but its most likely similar to akkadien laws.

They didn't