Why was the western front an important location in the war

The Western Front of World War I was opened in 1914 after the German Empire's army invaded Belgium and Luxembourg, so it gained military control of important industrial areas of France. The advance of the Empire underwent a dramatic turn after the first battle of the Marne, where the alliance between France and the United Kingdom defeated. Both sides -Aliados and Central Powers- settled in a sinuous line of fortified trenches, which extended from the North Sea to the Swiss border with France. That line remained static for most of the war.

its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.

im not sure on this one