My instant first thought, too!
They can apparently track "happiness" trends in postage stamp-sized countries in Central America, but don't bother to disaggregate the individual states of the U.S. Why?
Because happiness levels would correlate too closely with political affiliation, and it wouldn't be "politically correct" to point out that Dem-dominated states are generally miserable, pulling down the overall U.S. score.
Regards,
It is somewhat addressed in that Venezuela is a Communist hell-hole and they come in dead last. Emphasis on the “dead.”
Of course 3/4ths of the genpop reading seeing this don’t even know that.