Answer:
1. Mesopotamia (or Sumer) - 4,500 BC
2. Indus Valley Civilization - 3,300 BC
3. Nile River Valley Civilization (Ancient Egypt) - 3,100 BC
4. Yellow River (Huang He) Valley Civilization - 2,100 BC
Step-by-step explanation:
The ancient civilizations have developed around the major rivers. The reason for this was that the large rivers provided water for drinking and irrigation, but also enabled the large scale and very production production of crops because of the fertile sediments around their banks. The people settled in this places, and gradually started to develop, step by step leading to the first civilizations in the world. Some of the first civilizations that appeared were the Sumerian (4,500 BC), Indus Valley Civilization (3,300 BC), Egyptian (3,100 BC), and Yellow River Valley Civilization (2,100 BC).