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The assissination of Archduke Francis Ferdinand sparked World War One.
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The battle of Ypres.
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A German submarine sank the Lusitania killing 1,200 people, including 128 Americans.
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The Battle of Somme started.
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Use of the first tanks in the Battle of the Somme.
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About one million soldiers were killed in the Battle of Verdun.
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The United States declared war on Germany while entering the war.
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An armistice ends the war.
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Treaty of Versailles was signed, although the United States did not sign.
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The United States signs a peace treaty with Germany.
