Answer:
The trench system on the Western Front in World War I—fixed from the winter of 1914 to the spring of 1918—eventually stretched from the North Sea coast of Belgium southward through France, with a bulge outwards to contain the much-contested Ypres salient.
Explanation:
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By the Nuetrality acts. These acts made it illegal to sell arms to belligerent nations, or nations at war.