Despite initial mandate to stay neutral, U.S. leaders voted to officially join Allies in the Great War on April 6, 1917.

It was on April 6 in 1917, that the United States abandoned its stance of neutrality and officially joined the Allied powers ...

He was convinced that America's involvement in the war was essential to protect human freedom. Hemingway was 18 years old when he volunteered to be an ambulance driver for WWI. He suffered ...

The Merci Train boxcar was gifted by France to New Jersey in 1949 and went missing in 1958. It has finally been found.

When Europe plunged into war in 1914, Wilson, who like many Americans believed in neutrality, saw America's role as that of peace broker. The sinking of the passenger liner Lusitania by a German ...

The Brandeis University World War I and World War II Propaganda Posters collection includes nearly 100 different images (a majority from the WWI era) addressing a variety of American war aims. The ...

When Europe plunged into war in 1914, Wilson, who like many Americans believed in neutrality, saw America's role as that of peace broker. The sinking of the passenger liner Lusitania by a German ...

Victory MedalsThe United States issued these medals to members of the U.S. military who served in World War I. The back of the medal lists the Allied countries, while the front depicts a figure of ...

The DC Council commemorates the WWI memorial in their building, honoring local government employees who died in the war.

Photos courtesy of Getty Images. WW1: Can the Treaty of Versailles help us tackle climate change? documentWW1: Can the Treaty of Versailles help us tackle climate change? BBC correspondent David ...

The United States entered the First World War when it declared war on Germany on 6 April ... The Division of Armed Forces History in the National Museum of American History now holds this collection ...

A World War I medal has been returned to the family of Joseph William Morrison, who was a Private First Class in the Army ...