«Despite the fact that Puerto Ricans are U.S. citizens—and has more U.S. citizens than 21 states— they can’t vote for president, have no representation in the U.S. Senate and send only one non-voting delegate to the U.S. House. [...] But Puerto Rico is lucky compared to some of the other U.S. territories. American Samoans aren’t even automatically granted U.S. citizenship. [...] Instead, they’re considered U.S. nationals, but not citizens. Over on Guam, 27% of the island is occupied by U.S. Navy and Air Force bases, and a staggering high number of Guam citizens are veterans of the U.S. military, but they still have no voting rights.»
http://time.com/3736845/john-oliver-last-week-tonight-voting-rights/