Around the year 10,000 BCE humans began to plant seeds to grow food instead of hunting for food.
Farming creates food surpluses and increases population.
"Settled life allowed food surpluses to be grown and stored for future use, which in turn allowed populations to grow and develop increasingly complex societies." (Paragraph 6 The Neolithic Revolution)
Some people switch from farming to other kinds of work.
Some people switch from farming to other types of work like weaving baskets and cloth. "Flax was grown to be made into linen, while sheep and goats provided wool-these fibers were woven into cloth using the new technologies of spindles and looms." (Paragraph 7 The Neolithic Revolution)
Settlements grow larger.
"Civilization emerges in the Sumerian settlement of Ur on the Euphrates River, as well as near the Nile and Huang Rivers in Egypt and China" (Paragraph 22 Prehistory, Beginnings to 3000 BCE)
Some settlements grow into cities.
As food becomes more available civilizations grow larger forming into large cities.
Governments form in the cities.
"Those River valley civilizations exhibit growth in government, religion, social organization, writing and art." (Paragraph 22 Prehistory, Beginnings to 3000 BCE)