Final answer:
An oligarchy is a small group who rule a country after taking it over by force. They have total and complete authority over all aspects of the country's political, economic, and social life.
Step-by-step explanation:
An oligarchy is a form of government in which power effectively rests with a small elite segment of society. This small group, usually composed of military officers, takes over a country by force. They hold total and complete authority, controlling all aspects of the country's political, economic, and social life.