i was told it was because the English were losing, and so the Americans came in to help us out.
other people say it was because everyone else was doing it
1917
The US entered the war in April of 1917 and were on the Allies side.
1917 smart
1917
The US did enter World War 1, though not till 1917.
1917
US Congress declared war on Germany on 6th April 1917
The US enters WW1 in 1917
1917
The US joined the war on the side of the Allies on April 6, 1917.
War: 1914-1918 US military involvement: 1917-1918
The United States declaration of war is from 6 April 1917.