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.
It was a easy way to give everyone a place in society. I was organized and easy to maintain for the European governemnt, but it wasn't a fair system because peasants and serf were unable to work upwards in the society.
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What do you need help with ??
The last one would be most accurate but not for sure get others opinions before you submit