On the technology front, yes, war can sometimes spur government investment in technology, but that doesn't always help. Case in point, aircraft: In 1913, Igor Sikorsly had designed what would have been, in the absence of the war, the world's first airliner, with an insulated saloon, heaters lights, and the world's first airborne toilet. Unfortunately, the service was interrupted by the war, but if the war had been averted, I can easily imagine a sort of airliner race taking place, soaking up government funds to produce larger, grander, faster and longer-ranger aircraft as a matter of national pride, thus aeronautics gets spurred without millions being killed.