Because the first people to leave a trace of the written word in the archaeological record are the people of Sumeria. It follows that if there was writing there must also have been reading of that writing!
The Sumerians are credited with inventing writing as a practical means of record-keeping for agricultural transactions and administrative purposes around 3200 BCE in ancient Mesopotamia. This development eventually evolved into a more complex writing system known as cuneiform that enabled communication of ideas and stories beyond basic accounting needs.
The wheel invention
It is believed the Sumerians invented the plow.
Some say the Sumerians' greatest invention was cuneiform. Others say it was the wheel.
The invention of the plow was so important to the Sumerians because it helped farmers
The invention of the plow was so important to the Sumerians because it helped farmers
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The Sumerians
cuneiform witing
The invention of irrigation, the invention of cities, the invention of writing and the first monumental architecture.
plow
copper tools and bricks
The writing called cuneiform.