Flooding meant that crops weren't growing as well. Cities began to struggle. In the end, Sumer was invaded by the Elamites who came from modern-day Iran. Narrator: Hello, future people of the UK.

Ancient Sumerians - which lived in the "Fertile Crescent" of southern Iraq from around 5300 BC to 1940 BC - are often recognised for laying the groundwork for modern civilization and recent ...