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The bottom section of Asia Minor was also Dorian and they didn't have much of a sense of unity. In fact, The Ionians on Asia Minor formed the "Ionian League" and it was probably the most solid alliance in Hellenic history.

The Nile wasn't really irrigated at all due to the way it flooded and dried up seasonally. The Egyptians would wait for silt deposits prior to flood season and farm only in those months. However, the Nile had a series of tributaries that the Tigris and Euphrates lacked, making northern Egypt into a marshy and fertile region, similar to western China.

And yes, the earliest cities were built in Mesopotamia. That was the Sumerians in southern Mesopotamia who, as I said, invented writing and beer. They also had the earliest barter system.