That was then adapted by succeeding peoples, generation after generation of humankind who took what the Sumerians achieved and added, and or subtracted from what they learned.
When the Sumerians built the first cities, they created the first of almost every fundamental and essential element of our civilization because they were compelled to do so, because they were the first to confront the issues associated with civilization. That was then adapted by succeeding peoples, generation after generation of humankind who took what the Sumerians achieved and added, and or subtracted from what they learned. Civilization has been built brick by brick until this day and Sumeria was the first brick, the foundation upon which all others are placed.