Political Status of Puerto Rico: Brief Background and Recent Developments for Congress [June 12, 2017] [open pdf - 1MB]
"Puerto Rico lies approximately 1,000 miles southeast of Miami and 1,500 miles from Washington, DC. Despite being far outside the continental United States, the island has played a significant role in American politics and policy since the United States acquired Puerto Rico from Spain in 1898. Puerto Rico's political status-referring to the relationship between the federal government and a territorial one-is an undercurrent in virtually every policy matter on the island. In a June 11, 2017, plebiscite (popular vote), 97.2% of voters chose statehood when presented with three options on the ballot. Turnout for the plebiscite was 23.0% of eligible voters. Some parties and other groups opposing the plebiscite had urged their bases to boycott the vote. (These data are based on 99.5% of precincts reporting results.) After initially including only statehood and free association/independence options, an amended territorial law ultimately permitted three options on the plebiscite ballot: statehood, free association/independence, or current territorial status."
CRS Report for Congress, R44721
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html