Britain’s decision to leave the E.U. is a warning to America, by Anne Applebaum.

This referendum campaign … was not fought on the issues that are normally central to British elections. Identity politics trumped economics; arguments about “independence” and “sovereignty” defeated arguments about British influence and importance. The advice of once-trusted institutions was ignored. Elected leaders were swept aside. If that kind of transformation can take place in the U.K., then it can happen in the United States, too.