The image of red-state governors mustering uniformed troops for duty in blue-state cities has left many Americans with the foreboding sense of a nation dangerously divided, perhaps even drifting toward open conflict. Mr. Trump denied statistical reality last week when he was asked whether he might send federal forces into high-crime cities in Republican-led states." Said Trump: "Sure, but there aren't that many." "There are that many: Kansas City, St. Louis and Springfield, Mo.; Birmingham, Ala.; Cleveland, Dayton and Toledo, Ohio; Tulsa, Okla.; Memphis and Nashville; Houston; Little Rock, Ark.; Salt Lake City; and Shreveport La., all have crime rates comparable to Washington's, according to F.B.I. statistics."