All this happened, more or less.

civilisation, as we now callit, occured only after early man had begun to live in cities. Cities were far more competitive, experimental environments than anything that had gone before. The city is the cradle of culture, the birthplace of nearly all our most cherished ideas. Ibid. p.74.
In the classical definition, civilisation consists of three or more of the following: cities, writing, the specialisation of occupation, monumental architecture, the formation of capital. But this, while not wrong, ingores the underlying principle. Sometime in the late fourth millenium BC, people came together to live in large cities. The transition transformed human experience for the new conditions rquired men and women to cooperate in ways they never had before. It was this close contiguity, this new face-to-face style of cohabitation, that explained the proliferation of new ideas, particularly in the basic tools for living together - writing, law, bureacracy, specialised occupations, education, weights and measures. Ibid. p.75