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Allied forces halt Germany advance into France during First Battle of the Marne
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Archduke Francis Ferdinand is assassinated
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Battle of Verdun ends with 555,000 French and 450,000 German casualties
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Peace conference begins at Paris
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Allied and German representatives sign Treaty of Versailles. The U.S. state sign the Treaty of Guaranty, pledging to defend France in the case of an unprovoked attack by Germany
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United States Senate fails to ratify Treaty of Versailles
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Treaty of Versailles takes effect
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United States Senate fails to ratify Treaty of Versailles for second time