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. Would you like to visit me at the dawn of ...

(According to archaeologists, the "Uruk period" is the earliest phase of the Sumerian civilization, between 4000 and 3100 B.C.) Similar progressions have been seen at other sites in ancient ...