Military leaders:
Dwight Eisenhower (USA)
Chester Nimitz (USA)
Douglas MacArthur (USA)
Lord Mountbatten (UK)
Bernard Montgomery (UK)
Zhukov (Soviet Union)
Chiang Kai-Shek (China)
Willhem Keitel (Germany)
Erwin Rommel (Germany)
Badoglio (Italy)
Yamamoto (Japan)
Political Leaders:
Winston Churchill (UK)
Joseph Stalin (Soviet Union)
Franklin Roosevelt (USA)
Emperor Hirohito (Japan)
Adolf Hitler (Germany)
Benito Mussolini (Italy)
We probably wouldn't have had as much technicologic inventions and the leader system would probably be messed up as well.
Regional diversity affected the development of Islam because as Islam spread it went to numerous culturally diverse regions. These regions and peoples adopted Islam and developed the religion differently. From regions as wide as West Africa to Indonesia, Islam took on unique forms because of the people who took up the religion and adapted the religion along the way.
Answer:
By implementing public work projects and a rearmament program.