Answer: They can declare laws or presidential actions unconstitutional.
The big three formalized the plan to divide Germany into four zones of occupation.
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.
