Emmanuel Macron has been re-elected in France. The world should give a sigh of relief that French voters were rational enough to recognize the threat his uber right-wing challenger, Marine Le Pen, posed to France.

Ms. Le Pen,softening her image if not her anti-immigrant nationalist program, rode a wave of alienation and disenchantment to bring the extreme right closer to power than at any time since 1944. Her National Rally party has joined the mainstream, even if at the last minute many French people seem to have voted for Mr. Macron to ensure that France not succumb to the xenophobic vitriol of the darker passages of its history.

...If Brexit was a blow to unity, a French nationalist quasi-exit, as set out in Ms. Le Pen’s proposals, would have left the European Union on life support. That, in turn, would have crippled an essential guarantor of peace on the continent in a volatile moment.

Le Pen has conceded defeat.