The city-states of ancient Mesopotamia were independent cities constructed around temples and entirely self-contained within mighty perimeter walls.<span> City-states were unified with each other only by their shared use of the Sumerian language. They spent most of their time engaged in conflict over resources.</span>
They migrated to Africa because they were slaves
The correct answer to this is A. Devolution
Separatism is usually based on ethnicity or religion while decolonization occurs in former colonies who don't want to be colonies anymore. Supranationalism is an adjective describing something out of the domain of a single national government.
Gasoline, smoke from factories, oil
