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The U.S. entered WWI in 1917 and the war ended in 1918.
America contributed to World War 1 before 1917 by supplying the warring countries with military goods. This led to an economic boom that sustained America's war spending when it eventually entered the war.
At first they tried to remain neutral but when they realized that Britain and France were close to losing the war they entered in 1917 because they thought that if Germany won it would be a direct threat to democracy.
April 1917 for WW1 Dec 1941 in WW2
1917
1917 smart
The U.S entered WW1 on April 6, 1917
No, the U.S. entered World War 1 in 1917.
April 1917
bob the builder
The US entered WW1 in 1917. The US entered WW2 in 1941.
The US entered World War 1 on April 6, 1917. The war ended about one and a half years later.
The allies entered the war in 1914; the US entered the war in 1917.
The United States entered the war in April 1917 on the side of France, Great Britain, & Italy to defeat Germany in November 1918.
It was The US entered WW I on April 16th, 1917.
They didn't. They entered late, In 1917
The US entered WW1 the last yr, which means 1917-1918. The United States declared war on Germany on April 6, 1917, thus entering WWI. America entered after the sinking of the Lusitania off the Irish coast by German u-boats when 3,000 U.S. citizens were killed.