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Oligarchy | Definition & Facts | Britannica
Oligarchy Definition & Meaning - Merriam-Webster
Oligarchy - Wikipedia
Oligarchy - National Geographic Society
What Is an Oligarchy? Definition and Examples - ThoughtCo
OLIGARCHY | definition in the Cambridge English Dictionary
What is an oligarchy? Definition and examples throughout history.
OLIGARCHY | English meaning - Cambridge Dictionary
OLIGARCHY Definition & Meaning | Dictionary.com
Oligarchy Definition & Meaning | Britannica Dictionary