What's the context?
The industrial revolution
Even further back...
The agricultural revolution
Trade?
Communication?
Travel?
Exploration?
The four river valley civilizations were the Tigris & Euphrates Valleys, the Nile River Valley, the Indus River Valley, and the Yellow River Valley. Civilizations developed around rivers because their waters provided places to hunt and fish. Also, as the rivers flooded, the lands around them became fertile.
Answer:
tha valuse is is the rules nad everything rules related
Explanation:
I believe It the answer would be an economic Reformation because the way they paid to save their own souls....