WWII was a conflict within nations and within INDIVIDUALS ... as well as between nations

War ,to give it a quick definition, is a violent conflict conducted between nations, not between individuals.

But the intensity of commitment with which individuals and groups within any nation fight in that nation's war can vary immensely --- perhaps never more so than during WWII.

The smallest Manhattan project had the BIGGEST impact : the irony of 75 years on ...

With the hindsight of 75 years on, for the Modern Age 1945 turned out to be "the best of times and the worst of times" , its apogee and  its nadir.