On Monday night, President Trump declared himself a nationalist. At a rally in Houston, he distinguished nationalists from \u201cglobalists,\u201d people who, according to Trump, care more about the world than about their own tribe. Nationalism has a fascist pedigree, and Trump has a history of using race, religion, and ethnicity to turn the people he sees as real Americans\u2014people who look like him\u2014against those who have \u201cArab\u201d or \u201cMexican heritage.