Puerto Rico was claimed by Spain in 1493 and ceded to the US in 1898 after 400 years of Spanish rule. Puerto Ricans were granted citizenship in 1917. Since 1948, popularly elected governors have served and in 1952 a constitution provided for internal self-government. In plebiscites, voters chose to retain commonwealth status, though in 2012 a majority voted for statehood which is pending Congressional approval.