>Are we supposed to focus only on the certain cultures and ignore others when we talk about health and life expectancy?
If you want to get anything done, then hell yes! If life expectancy is low in Concord because of too many Doritos, but it's low in Phoenix because of a bad medical system, and it's mysteriously high in Fresno, you very much want to disaggregate. And you definitely don't want to ask "What is going so well in 'the U.S.'(Fresno)?" and then look at Concord.
If you want to get anything done, then hell yes! If life expectancy is low in Concord because of too many Doritos, but it's low in Phoenix because of a bad medical system, and it's mysteriously high in Fresno, you very much want to disaggregate. And you definitely don't want to ask "What is going so well in 'the U.S.'(Fresno)?" and then look at Concord.