The ancient civilization located in Mesopotamia (Tigris & Euphrates River Valley) was the Sumerians. Here's why:
1. Geographical Location: Mesopotamia, also known as the "land between the rivers," was situated in the region of modern-day Iraq and Kuwait, between the Tigris and Euphrates rivers.
2. Sumerians: The Sumerians were one of the earliest known civilizations to settle in Mesopotamia around 4000 BCE. They developed a sophisticated society with advanced agriculture, architecture, writing (cuneiform script), and religious beliefs.
3. Inventions and Achievements: The Sumerians are credited with several inventions and innovations such as the wheel, the first written language (cuneiform), the concept of the city-state, and irrigation systems to control water flow from the rivers for agriculture.
4. Cultural Significance: The Sumerians laid the foundation for future civilizations in the region by establishing systems of governance, trade, and cultural practices that influenced subsequent societies like the Akkadians, Babylonians, and Assyrians.
Therefore, the Sumerians were the ancient civilization located in Mesopotamia (Tigris & Euphrates River Valley).