You mean what possible advantage could Oligarchy have?
Oligarchy could mean that people in power will have good education and for example won't be manipulated by populists. For example often people choose their representatives based on very little information, and in an oligarchy, where a small portion of a society (the riches and best educated) rules, it could be more likely that the rulers will have the necessary education and preparaation.
The norths side
Harriet Ann Jacobs (February 11, 1813 – March 7, 1897) was an African-American writer who escaped from slavery and was later freed. She became an abolitionist speaker and reformer. Jacobs wrote an autobiographical novel, Incidents in the Life of a Slave Girl, first serialized in a newspaper and published as a book in 1861 under the pseudonym Linda Brent. It was a reworking of the genres of slave narrative and sentimental novel, and was one of the first books to address the struggle for freedom by female slaves, explore their struggles with sexual harassment abuse, and their effort to protect their roles as women and mothers.
Accomplishments of the National Association for the Advancement of Colored People (NAACP) range from helping establish reform to building strong communities. The group helped promote civil rights and played a part in ending segregation.
The answer is: adapt to one's environment.
According to piaget, organisms with low intelligence tend to only recognize low variety way of living and unable to adapt to extreme change in environment. More often than not, this would make such organisms much more likely to extinct.
Intelligent organisms on the other hand, can adapt to extreme changes and had a very high likelihood to survive to the next generation. (humans for example can live in both cold north pole and hot dessert while no other organisms able to live in two completely different climate, indicating how good we are in adapting to our environment)
