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How did the new weapons introduced in World War I contribute to a war of attrition?
The sinking of merchant vessels by U-boats contributed to the blockade and starvation of
nations at war.
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Machine guns and powerful, long-range guns led to armies attempting to wear down an
enemy to the point of collapse.
The introduction of airplanes on the battlefield made armies less dependent on infantry
and mounted soldiers.
Mustard gas and other forms of chemical warfare created new industries in science that
focused on soldiers' safety.