Background:
Discovered by Christopher Columbus in 1493, the island was ceded by Spain to the US in 1898 following the Spanish-American War. A popularly elected governor has served since 1948. In plebiscites held 1967, 1993 and 1998, voters chose to retain commonwealth status. Still, there are highly active movements promoting statehood and independence.
... The median age is 41 years. For every 100 females there are 98.0 males. For every 100 females age 18 and over, there are 96.5 males.
The median income for a household ...