Both Europe and Japan had a "cast system" you could say, where peasants worked the land that the nobles owned. (The Japanese had their own terms for the people, I just can't remember them.) During this time, Europe had knights and these Knights had a code called Chivalry. Over in Japan, there were Samurai with a very similar code which was called Bushido. Hope this helps.
Answer:
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Explanation: btw i am also finding this questions answer
I think it is the answer is because they need to make more justice
I think its mathematics,i could be wrong but i would mathematics
Most soldiers started to use gas bombs