Answer:
Civil war
Explanation:
The civil war was one of the greatest war in America's past and many people including soilders risked their lives.
A. For the first time an African American was elected president of United States
The answer is most likely D
This began the Middle Kingdom and a new period of stability, which lasted from 2055 to 1650 B.C.E. The Middle Kingdom has been labeled by historians as a the Golden Age due to the economic, social and political stability of the time period. Trading, arts and literature all flourished in the Middle Kingdom.