City-states in ancient Sumer required many people with different specialties living and working together. What led to their formation? A. better systems of trade B. better tools for hunting C. better tools for agriculture D. better storage of food
Sumera were the first people, to migrate to Mesopotamia and created a great civilization along the 5500 million years they build the settlements along the river valleys. They had advanced levels of technology such as irrigation techniques.
