Against the back­drop of the ac­cel­er­at­ing pres­id­en­tial race, the strains of ad­apt­ing to the na­tion’s hurt­ling demo­graph­ic and cul­tur­al change are grow­ing in­creas­ingly vis­ible. For all of the eco­nom­ic anxi­et­ies many Amer­ic­ans still ex­press, the most po­lar­iz­ing con­flicts this year are di­vid­ing the na­tion along lines of race, eth­ni­city, and cul­ture, not class.