Answer:
The Japanese launched a surprise attack on the United States.
Explanation:
Nuclear war duh. That's why it was called the Cold War in the first place there was no fighting to begin with. It was just a series of threats and who could have the best things like the Space Race.
During the period between the Han and Sui Dynasties, in China, is known as the "Period of Disunity." This period is also known as the "Six Dynasties" period. During this period the country was divided into smaller regions. These six regions; Chen, Liang, Southern Qi, Liu Song, Eastern Jin and Wu, were all in conflict with on another. There was not a unified China.