Rep. Steve King, the nativist Republican congressman from Iowa who has likened illegal immigrants to “livestock,” is just asking questions. In a New York Times interview, he says: “White nationalist, white supremacist, Western civilization—how did that language become offensive?” Mr. King said. “Why did I sit in classes teaching me about the merits of our history and our civilization?” In the recent past (2017) King insisted that “we can’t restore our civilization with somebody else’s babies,” and only a few years before that (2013) he insisted that “there isn’t anyone that can fairly characterize me as anti-immigrant.” Which pretty much tells you what kind of bubble the guy is living in: He’s openly hostile to immigration, both legal and illegal, but refuses to admit as much. Still, even if the Vietnam draft-dodger can’t be swayed, it’s worth at least pointing out to those who might be open to discussion that equating America with whiteness is fundamentally un-American. The United States has a deeply troubled history with race and racism, but one of the few things that makes our coun...