Sumerian farmers ran out of space to farm for the amount of people they needed to feed.The plains were big enough to feed their population, but it was hard and dry for most of the year
Sumerian farmers did not have enough space to farm for their growing population.The plains were big enough for the farm they needed but it was hard and dry for most of the year.The plains were also promising for farming as well because in the spring the Euphrates and Tigris rivers flooded into the valley.
4.4 Uncontrolled Water Supply in the River Valley
The Sumerian's could not predict the floods that wash away their crops.For most of the year the soil was hard and dry.They built irrigation system. Some examples of what the Sumerians built are levees, dams, and canals.
4.5 Difficulties in building and maintaining complex Irrigation system.
The canals kept getting clogged with silt.Farmers could not live far apart because they had to be connected by canals.The Sumerian's eventually worked together to maintain their irrigation system.
4.6 Attacks by Neighboring Communities
The plains had no natural boundaries to protect the Sumerians' from their neighbors.Cities up river took water from the down river cities which led to fights.Sumerians started building a wall out of mud bricks to protect themselves. They also dug moats around the cities's walls.
4.7 From Small Farming Villages to Large City-States
Food shortages forced the Sumerians into the river valley.The Sumerians in the river valley either did not have enough water or had to much, so they built a complex irrigation system.Each city-state was like is own country and often forgot with other city-states, and protected itself.