Iran Before the Iranians

The Elamite civilization in Iran, first developed in the Susian plain, under the influence of nearby Sumeria and Mesopotamia in the Tigris-Euphrates valley. Around 3500 B.C., animal drawn wheeled carts were in use in Sumeria. They also used ploughs to till their land, and oars to propel their ships on the Euphrates river. The Sumerians were the most advanced and complex civilization in the world at that time, and by 3100 B.C. they had invented a system of writing which was the first of its kind in the world.