Western Frontiers, 1860-1890- During the four years of World War I, the Allied and Central Powers were locked in trench warfare along the Western Front. In what two countries was most of the Western Front?

Aslan/Jill can you please help me with the following questions. Thank You!

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Western Frontiers, 1860-1890 - Rand McNally Education

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Question7.

7. During the four years of World War I, the Allied and Central Powers were locked in trench warfare along the Western Front. In what two countries was most of the Western Front?