Final answer:
The period during which villages evolved rapidly into cities, leading to the rise of civilization in Sumeria, is known as the Neolithic Transition.
Step-by-step explanation:
During what is known as the Neolithic Transition, villages evolved into cities quite rapidly. The cities of Sumeria, including the city of Uruk, grew significantly in size compared to previous population concentrations. Intensive agricultural practices, which started around 8000 BCE, and specifically around 5500 BCE in southern Mesopotamia, facilitated the growth of these urban centers. This period saw a major transformation in society where agriculture led to settled communities that would eventually become the earliest civilizations with urban settings and complex social structures.
Advances in technology, the specialization of labor, and the development of a surplus economy contributed to the rise of early cities. By the end of the fourth millennium BCE, Sumer was dotted with various urban areas of different sizes, with Uruk being the largest and perhaps the first true city in world history.