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Which of the following new pieces of technology most directly caused the trench warfare of the Western front of World War I?

A) Machine Guns
B) Poison Gas
C) Airplanes
D) Tanks

User Guille
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Machine guns most directly caused the trench warfare of the Western front of World War I. Answer (A) is correct.
User Ojek
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Answer: A) Machine Guns

Explanation: All of these had an effect on trench warfare, but machine guns had the largest effect because of their method of strafing wide swaths of flat land, prompting armies to dig trenches for cover.

User Salman Paracha
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