Development in weaponry WWI

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…economic and cultural resource of the populations of belligerent states. WWI was first war where the entire populations, industrial capacities and economies of most of the combating powers were utilized in the war effort. WWI was also established the alliance system that would be used in the second World war, and it made a pre-eminent world power of the U.S. So WWI should and must be considered the most significant event of 20th century.