Easter Island

Heyerdahl experimentally proved in 1947 the feasibility of sailing from South America to Polynesia on the Kon-Tiki raft.

An excerpt from the article 29 facts about Easter Island
According to legend, the "long-eared" people, who constituted the aristocracy, were almost completely exterminated during an uprising by the oppressed "short-eared" people of Polynesian descent.
Civil war took place there after the Dutch discovered the island in 1722 and before James Cook discovered the Polynesian islands in 1773/1774.