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The treaties and alliance system led the Central and Entente powers to each declare war on each other.
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The battle was one of the largest of World War I, in which more than 1,000,000 men were wounded or killed, making it one of the bloodiest battles in human history.
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The German Foreign Secretary Arthur Zimmermann sends a telegram to his ambassador in Mexico, instructing him to propose to the Mexican government an alliance against the United States.
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The Meuse-Argonne Offensive, also known as the Maas-Argonne Offensive and the Battle of the Argonne Forest, was a part of the final Allied offensive of World War I that stretched along the entire Western Front.
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