Question: What us state has the highest population density?
qaPairs: question: What us state has the highest population density, in 2015?
answer: New Jersey
question: What us state/territory has the highest population density in 2015?
answer: Washington, D.C.
District of Columbia
question: What us state has the highest population density, in 2013?
answer: New Jersey
question: What us state/territory has the highest population density in 2013?
answer: Washington, D.C.
District of Columbia
question: According to the 2010 census, what us state has the city with the highest population density?
answer: New Jersey