WWII was the last time modern industrialized nations were openly at war with each other. The nuclear bomb changed everything. That's one reason WWII is regarded

WWII was the last time modern industrialized nations were openly at war with each other. The nuclear bomb changed everything. That's one reason WWII is regarded differently than anything that has come since. Hitler's extermination of the Jews will have him as a historical villain for a long, long time.