The only reason why the German's were so strong was because the rest of the world was asleep as it was still recovering from WW1 and didn't think it would happen again so early. They had Europe but wanted the world which was there undoing as the allies launched there assaults by destroying them in Africa and controlled the war after that. The rest of the world never had the fire power that they created but they had the smarts which saved the day like the fake drowned soldier with top secret info of the allies attacking then in Greece rather the intend of Sicily where they wiped them out quickly and was the beginning of the end. My only grudge is how did the World after defeating them allow them to once again become a powerhouse so quickly likewise Japan.