What was the last city or state ruled by an oligarchy

The Greek city-state was governed by an oligarchy? Oligarchy in the Greek polis. Oligarchy supposes the government of a minority, while democracy supposes the government of many people.

a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.

what are the options so i can answer it