Primary Sources: America (U.S.A.) History

 In the summer of 1914, the heir to the throne of Austria-Hungary was assassinated, setting off a sequence of events that eventually drew most of Europe into full-scale war. The Central Powers (led by Germany, Austria-Hungary, and the Ottoman Empire) fought the Allies (led by France, Great Britain, and Russia) as the conflict spread from Europe to the Middle East and then to other parts of the world. The United States remained neutral at the beginning of the war. Individual Americans supported one side or the other, although the majority were sympathetic to the Allies. Many contributed to relief efforts; others volunteered as ambulance drivers or nurses, or even as pilots and soldiers. However, most agreed with President Woodrow Wilson’s commitment to keeping the U.S. out of the fighting. However, in early 1917, a series of events changed American attitudes. Earlier in the war, Germany had prohibited its submarines from sinking civilian and neutral ships, due largely to U.S. protests. In February 1917 it resumed unrestricted submarine warfare against all ships in the war zone. Shortly afterward, an intercepted German telegram revealed a plan offering Mexico territory it had lost to the U.S. during the Mexican-American War (1846-48) in exchange for its support. The United States World War One Centennial Commission

The U.S. made its major contributions in terms of supplies, raw materials, and money, starting in 1917. American soldiers under General of the Armies John Pershing, Commander-in-Chief of the American Expeditionary Force (AEF), arrived at the rate of 10,000 men a day on the Western Front in the summer of 1918. During the war, the U.S. mobilized over 4 million military personnel and suffered the loss of 65,000 men. The war saw a dramatic expansion of the United States government in an effort to harness the war effort and a significant increase in the size of the U.S. Armed Forces. Wikipedia

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