There’s more than one type of isolationist. Some in the 1930s were pacifists on philosophical grounds; others opposed Franklin Roosevelt’s support for the British, fearing it would drag America into a European war; and some even admired the Nazis. The America First Committee, for which Charles Lindbergh was spokesman, contained the full range of these views. Since President Trump has made “America First” his calling card, one might assume that Lindbergh & Co. are the antecedents of his foreign policy.

But they’re not....