While running for President, Donald Trump asked African Americans, “What do you have to lose by trying something new like Trump?” As it turns out, one answer is health insurance. The likelihood of having health coverage shouldn’t vary by a person’s race or ethnicity. The Affordable Care Act (ACA) helped cut the uninsured rate for nonelderly African Americans by more than one-third between 2013 and 2016, from 18.9 percent to 12.1 percent. But that’s still well above the 7.5 percent uninsured rate for whites, so we can ill afford to reverse this progress. Unfortunately, that’s exactly what...