From Project Syndicate

According to exit polls, Trump won 53% of white male college graduates, and 52% of white women (only 43% of the latter group supported Clinton); he won 47% of white Americans between the ages of 18 and 29, compared to 43% for Clinton; and he beat Clinton by 48% to 45% among white college graduates overall. These Trump supporters do not fit the stereotype at the center of the economic narrative.

Meanwhile, more than half of the 36% of Americans who earn less than $50,000 annually voted for Clinton, and of the remaining 64% of voters, 49% and 47% chose Trump and Clinton, respectively. Thus, the poor were more favorable toward Clinton, and the rich toward Trump. Contrary to the popular narrative, Trump does not owe his victory to people who are most anxious about falling off the economic ladder.

A similar story unfolded in the UK’s Brexit vote, where the “Leave” campaign asserted that the EU’s supposedly burdensome regulations and exorbitant membership fees are holding back the British economy. This hardly amounts to an agenda to fight economic inequality and exclusion, and it is revealing that rich businessmen wrote the largest checks to support Leave.

(Emphasis added). There’s no one single explanation for the two upheavals.