How did warfare change between 1900 and 1946? 

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Warfare changed in many very important ways over this time.  Let us look at two of them.

Technologically, warfare became much more mechanized and industrial over this time.  At the beginning of the time period, there were no machine guns or tanks or airplanes.  By the end of the period, these sorts of weapons decided WWII.

Socially, warfare changed because of this mechanization.  The idea of "total war" came to the fore.  The people who produced the weapons came to be targets for attack even though they were civilians.  The whole of a society also had to be engaged in the war effort so as to produce the huge amounts of materiel needed to fight.

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