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Luxembourg and Belgium are invaded by Germany. Alsace is invaded by France. British troops land in France. Great Britain, Russia, Italy, Australia, New Zealand, South Africa, Rhodesia, Romania, Greece, France, Belgium, the United States, Canada, Serbia, India, Portugal, Montenegro, and Poland became allies against Germany.
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Allied forces halt German advance into France during the First Battle of the Marn
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Germany begins a naval blockade of Great Britain.
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Allied forces land on the Gallipoli Peninsula of the Ottoman Empire.
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German submarine sinks the passenger liner Lusitania during the crossing from New York to Liverpool, England, killing 128 Americans.
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Battle of Verdun ends with 550,000 French and 450,000 German casualties.
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Germany returns to unrestricted submarine warfare halted after the sinking of the Lusitania.
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The United States severs diplomatic relations with Germany.
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The United States declares war on Germany.
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General John J. Pershing, newly selected commander of the American Expeditionary Forces, arrives in England with his staff.
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American women recruited to serve as bilingual telephone operators for the AEF arrive in Europe.
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President Woodrow Wilson presents to Congress his outline of Fourteen Points required for peace.
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Russia signs the Treaty of Brest-Litovsk with Germany.
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Germany begins its final offensive of the war.
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United States forces are victorious in the Battle of Cantigny, the first independent American operation.
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American forces stop the German attempt to cross the Marne River at Chateau-Thierry.
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Allied forces begin the attack at Meusse-Argonne, the final offensive of the war.
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