Answer: President James Madison
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If, the war described in the question is referred to second war then:
This war was considered as the greatest war configuration in the history in the humanity unleashed by nazi Germany, fascist Italy and militaristic japan.
At the early years of the war the ally countries were France, england and soviet Union.
The largest losses corresponded to the Soviet Union wich lost 27 million people.
Hitler’s rise to power started when he became politically involved and joined the Deutsche Arbeiterspartei. From there he worked himself up in the party, which later became the Nazi Party, through charm, violence and cunning negotiations. He was an excellent speaker and surrounded himself with people who, like him, were not afraid to use violence to fulfil their political objectives. At one stage, Hitler recognized that he was one of the best speakers in the Nazi party and demanded that they make him party leader or he would walk out. They conceded and he became party leader. Hitler became Führer when Hindenburg died, Hitler declared himself jointly president, chancellor and head of the army. Members of the armed forces had to swear a personal oath of allegiance not to Germany, but to Hitler. This formally made Hitler the absolute ruler of Germany.