The agricultural revolution (or Neolithic Revolution) was introduced when the homosapiens began to farm, domesticate animals, and settle in permanent villages. This made it easier to collect food and was WAY more efficient than being hunters and gatherers. As stated in PREHISTORY, BEGINNINGS TO 3000 BCE, "a shift from hunting animals and gathering food to taming and keeping animals and growing regular crops."
Settlements grow larger.
Since the new method of farming and domesticating animals was faster and more efficient than the old habit (hunting and gathering), a food surplus commenced.
Some people switch from farming to other types of work.
The new surplus allowed for the homosapiens to flourish and intake enough, if not, more than enough, food. This caused the population to grow increasingly due to less deaths from starvation and more reproduction.
Some settlements grow into cities and develop governments.
Due to the increasing population, the homosapiens settlements grew larger and larger. PREHISTORY, BEGINNINGS TO 3000 BCE states, "people are able to form more permanent villages."
Because farming was so successful and the population was growing, there were progressively more and more people who had the time to do other jobs, resembling making tools, pottery, weapons, and clothing. According to THE NEOLITHIC REVOLUTION, "As a result, [of these new jobs] craft specialization appeared."
As a result of new and more diverse jobs, ginormous population growth, and the expansion of settlements, the groups of homosapiens begin to form cities and governments. Civilization is born. As reported by THE NEOLITHIC REVOLUTION, "larger populations living in villages and eventually the first cities created the need for centralized government, law codes, and record keeping through writing."