« Two Fronts » Harry Turtledove

Four years later, the civil war in Spain drags on, even after General Franco’s death. The United States, still neutral in Europe, fights the Japanese in the Pacific. Russia and Germany go toe–to–toe in Eastern Europe—yet while Hitler stares east, not everything behind him is going as well as he would like. But nothing feeds ingenuity like the fear of losing. The Germans wheel out new tanks and planes, Japan deploys weapons of a very different sort against China, and the United States, England, and France do what they can to strengthen themselves against imminent danger.