World War I

In 1914 the United States Army comprised 98,000 men, of whom some 45,000 were stationed overseas. The regular army was backed up by the 27,000 troops in the National Guard.

Organization of the American Expeditionary Forces - History of The Army

That was the headline screaming from newspapers around the country on April 6, 1917, as the United States declared war on the German empire.The United States had avoided being drawn into what was then known as "The Great War," which had been raging in Europe since 1914. But German unrestricted submarine warfare -- which U.S. leaders regarded as war on civilians -- led to this juncture. President Woodrow Wilson, who had just been re-elected under the slogan "He Kept Us Out of War," felt he had no other option.

World War I - U.S. Army Center Of Military History - Book Shelves

On April 2, 1917, President Woodrow Wilson addressed Congress, asking for a declaration of war against Germany. Just over two months earlier, on January 31, the German government had announced its resumption of “unrestricted submarine warfare.” With the announcement, German U-boats would without warning

The American Expeditionary Forces (AEF) was the expeditionary force of the United States Army during World War I. It was established on July 5, 1917, in France under the command of General John J. Pershing. During the United States campaigns in World War I it fought alongside the French Army, British Army, Canadian Army and Australian Army on the Western Front, against the German Empire.

The United States declared war on Germany on April 6, 1917, during World War I. The U.S. was an independent power and did not officially join the Allies. It closely cooperated with the Allies militarily but acted alone in diplomacy. The U.S. made its major contributions in terms of supplies, raw material and money, starting in 1917.