Question

Which plains acted as bedrocks for the growth of the earliest human civilization and urban centre?

Answer 1

They are cities, bronze technology, writing, great ceremonial buildings, temples, monumental art, hierarchies and class division, all sanctioned by some form of law, and held together by organized military force.
They hide very different conceptions of what actually is civilization, the ultimate goals of organized human life on earth, moral, intellectual, political, and spiritual.
They are possessive individuality, scientific utility, and free market philosophy,They were because with no natural frontiers, Mesopotamia was always at risk from its neighbors. By creating an artificial landscape in the southern plain, with elaborate irrigation systems needed to sustain city civilizations, their very survival depended on contact with neighboring lands and trade for others' natural resources, which, if refused, would cripple their economy.