Mesopotamia is a historical region and it is located on the Tigris and Euphrates Rivers.
Its modern day country corresponds to Iraq
We had to move again so we moved to a place called Sumer.
We moved to the foothills in northern Mesopotamia called Zagros
We have had problem in lack of space because of increasing population.
We have quite more room but we have had a problem with the uncontrolled water supply.
When the land was dry, the farmers poked holes in the levees, allowing the water to flow through the holes and into the thirsty fields. Sumerian farmers began creating irrigation systems for their fields. They built levees along the sides of the river to prevent flooding.
Another problem arose and we had to clean the canals regularly so they did not get clogged.
Gradually, villages came to depend on one another to build and maintain this complex irrigation system.
As Sumerian cities grew they fought over the right to use more water
As you've seen, beginning around 3500 B.C.E., the Sumerians progressed from living in small farming villages to building large, walled city-states.