Maybe the population migrating to the United States between 1975 and 1995 were less happy than people who were here at the beginning of that time. Immigration w

Maybe the population migrating to the United States between 1975 and 1995 were less happy than people who were here at the beginning of that time. Immigration was accelerating over that time period, and it makes sense that new immigrants would be less happy than more established folks. Stats can be a bitch to interpret.