The longevity gap between “two Americas” has widened since 1990, says a new study. One America is mostly white and well educated, and the other is ethnic or undereducated  and dying about a decade sooner than their more affluent counterparts. The gap between college-educated whites and African Americans who did not complete high school is “simply unbelievable,” stated S. Jay Olshansky, lead author of the extensive new analysis published in the August issue of the prestigious health policy journal Health Affairs.