Japan must surrender without any conditions, or face destruction.
The intent of the passage is clear that the government of Japan has to surrender unconditionally and also commit to such action by providing assurance. Failure to do that will result in Japan facing destruction
He maintained power through a combination of fear and massive propaganda.
The Sumerians were the first great civilization in Ancient Mesopotamia. They were able to create the first city-states during 5000-3500 B.C. in the southern parts of Mesopotamia. It was their very first great achievement that led them to become a great civilization.
