Populated for centuries by aboriginal peoples, Puerto Rico was claimed by the Spanish Crown in 1493 after Christopher COLUMBUS' second voyage to the Americas. In 1898, after 400 years of colonial rule that saw the indigenous population nearly exterminated and African slave labor introduced, Puerto Rico was ceded to the US as a result of the Spanish-American War. Puerto Ricans were granted US citizenship in 1917. Popularly elected governors have served since 1948. In 1952, a constitution was enacted that provided for internal self-government. In plebiscites held in 1967, 1993, and 1998, voters chose not to alter the existing political status with the US, but the results of a 2012 vote left open the possibility of American statehood. A referendum held in late 2020 showed a narrow preference for statehood.

Economic recession on the island has led to a net population loss since about 2005, as large numbers of residents moved to the US mainland. In 2017, Hurricane Maria was the worst storm to hit the island in eight decades, and damage was estimated in the tens of billions of dollars.