I see we have another clueless sycophant of the power class fumbling around for an answer to the popularity of both the Brexit vote and Trump.  

It's not so much about "identity", whether group or national, nor even less about your speciously implied concomitants of racism, nationalism and xenophobia, Kathleen.  It is about the growing realization by millions of ordinary people that they have been caught in an ever-tightening global web of corporate and governmental control that has been reducing them to powerless and impoverished neo-feudal serfs, and about their long-0verdue and righteous rebellion against that web of control.  

THAT is your reason for the success of Brexit and the popularity of Trump.