1. Mesopotamia: Cradle of Civilization
Sumerian city-states in Mesopotamia (Tigris-Euphrates) pioneered the core institutions of civilization---writing, law, and urban kingship---that later Near Eastern and Western societies inherited.
Sumerians (c. 3500 BCE) developed cuneiform (first writing), the wheel, and ziggurats; Sargon of Akkad (c. 2334 BCE) built the first empire by uniting Sumerian city-states; Hammurabi of Babylon (r. c. 1792--1750 BCE) issued the Code of Hammurabi (c. 1754 BCE), a major written law code based on lex talionis (``an eye for an eye'') and organized by social class.
Sumer (the earliest city-state civilization, no single empire) vs. the Akkadian/Babylonian Empires (later unified political states built atop Sumerian culture).
Exam questions often imply Hammurabi's Code was the world's oldest law code---it is not; earlier Sumerian codes (e.g., Ur-Nammu) predate it. It is significant as the most complete surviving and most influential early code.
Sumer $arrow$ writing/cities; Sargon $arrow$ first empire; Hammurabi $arrow$ first great law code.