Yesterday (March 12), the European Union and Canada announced billions of dollars in retaliatory tariffs on U.S. exports. There’s a good reason nations are fighting back: Opposing Trump is helping world leaders domestically. Trump’s methods — insisting on tariffs, threatening to buy territory, insulting allies — have infuriated voters in Britain, Mexico, Ukraine and elsewhere. In Canada, for instance, the Liberal Party mounted an extraordinary comeback against the Conservatives this week. American conservatives had better come to their senses soon.