Between 3500 and 2300 B. C.E. ancient Sumer was ruled by a number of city-states. What left these city-states open to attacks by stonger groups?

This question is an opinionated one, and we don’t know anything about the module or anything, thus we can not answer it. but if you are having trouble on what it is asking basically it is just asking to (using your knowledge on the topic) say which topics you were most interested and which were the most challenging.hope this : p

There were not many poor people in holland who were willing to move.