The word would never have come together to fight a enemy and the world would have never realised that we all need to stop being prejudice. WWII was a race war, It was diffrent nationalitys, diffrent relgions, all battling it out. We needed to realise, like we did after WWII, that racism isn't acceptable. If we didn't, some races would try to battle it out with others, There would be many new wars, big superpowers, Not just two like the Cold war. Tension would rip it apart, Economies would collapse. WWII saved US economy, Hitler saved Germanys economy, Britain slowly regained it after WWII. WWII had to happen otherwise we wouldn't be here right now and we'd still be using steam ships and wooden aircraft.