In World War I, the western front became an immovable mass of heavily armed, defensive trenches. Why did this happen, and what effect did it have on the war's progress?

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The Answer of In World War I, the western front became an immovable mass of heavily armed, defensive trenches. Why did this happen, and what effect did it have on the war's progress?

In World War I, the Western Front Became an Immovable