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American Ambulance Field Service is recognized within the French Army. Before and after this date American men and women volunteer to assist the wounded of France, Britain and Belgium in the war
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The ocean liner RMS Lusitania is sunk by a submarine of the Imperial German Navy causing the death of nearly 1200 passengers and crew, among them 128 Americans.
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A French aviation unit largely made up of pilots from the United States. They, and those of the Lafayette Flying Corps, fly as combat pilots for France before the United States enters the war. Other Americans also fly in other Allied air services.
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United States severs diplomatic relations with Germany and President Wilson cites unrestricted submarine warfare as a threat to freedom of the seas.
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President Wilson demands, and the U.S. Senate approves a Declaration of War against Germany.
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The Selective Service Act is enacted to allow conscription of American men for military service.
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First American Soldiers killed in action. Three soldiers of the U.S. 1st Infantry Division are killed during a German trench raid on their position at Bathelemont.
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The first report of Influenza at Camp Funston, a center of mobilization in Kansas. The pandemic will kill between 20 and 30 million worldwide.
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