The North Koreans almost defeat South Korea, by forcing them onto the Pusan Perimeter.
If the government never had separate the power into three branches the government would've been anarchy government who would be greedy to share his powers to the citizens and he would ignore the concern of the citizens.
Trans-Saharan trade requires travel across the Sahara between sub-Saharan Africa and North Africa. While existing from prehistoric times, the peak of trade extended from the 8th century until the early 17th century. ... Cattle were introduced to the Central Sahara (Ahaggar) from 4000 to 3500 BC.
I believe the answer is B-The consent of the governed.