In my global history course in school we touched very briefly on the Sumerians. Talking about things such as their use of bronze/copper, chariots, and social class system, but nothing was really detailed. Ziggurat here, priest there, done. So how powerful were they and what kind of conflicts did they get into? Was Ur advanced for its time or right where it should have been? I have a great interest in this subject, and would love to know more.