How did trench warfare and new weapons technology impact the course of world war 1?

Probably the most important was the introduction of high explosive shells, which dramatically increased the lethality of artillery over the 19th-century equivalents. Trench warfare led to the development of the concrete pill box, a small, hardened blockhouse that could be used to deliver machine gun fire.

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what are local authorities doing to fix the problem

explanation:

a, he promoted disarmament