While comics typically focus on a purely fictional world, Jack Kirby, born Jacob Kurtzberg, and Joe Simon debuted Captain America in a comic book where he battles Adolph Hitler, who tumbles to the ground, falling like a rag doll, defeated and, really, destroyed. While today that might seem natural, it was distributed in 1940 before the United States entered the war, when Hitler was still in power and a sign that superheroes, more than fantasy, went to war in their own way. That larger-than-life-size cover is one of more than 70 items in “The Jack Kirby Way: How a boy...