Discovery of Puerto Rico

The history of Puerto Rico began with the settlement of the Ortoiroid people before 430 BC. At the time of Christopher Columbus's arrival in the New World in 1493, the dominant indigenous culture was that of the Taíno. The Taíno people's numbers went dangerously low during the later half of the 16th century because of new infectious diseases, other exploitation by Spanish settlers, and warfare.

Summary from Wikipedia (CC BY-SA 4.0)