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The United States officially entered World War I on April 6th of 1917, declaring war against Germany and mobilizing for an all-out effort to achieve victory. While never formally entering into alliance with Great Britain and France (and other Allied nations), the U.S. collaborated on land, at sea, and in the air as a dedicated "associate" of the Allies until victory was won.

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16y ago

From the very start, as it was part of the British Empire. On 4 August 1914 Britain declared war on Germany on its own behalf and that of the entire British Empire.

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Q: What date did the United States join allied powers in world war 1?
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Continue Learning about General History

What are the four big allied powers in World War 2?

The United States, The Soviet Union, The UK, and Canada


What European countries made up the allied powers in World War 2?

the United States, Great Britain, and France


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In the Allies Powers there were France, Britain, Canada, New Zealand, India, Soviet Union, Australia, and the United States of America. And in the Axis powers there are Germany, Italy, and Japan.


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No states were added to the United States during the World War One.


Who was a part of the treaty of Versailles?

Germany and the Allied Powers that fought against Germany during World War I were part of the Treaty of Versailles. The peace treaty was signed in June of 1919. Some of the Allied Powers were the United States, France, Italy, Japan, and the British Empire.

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The allied powers in both World War I and World War II were the Soviet union, the United States, the United Kingdom, China, the Nationalists and the Communists.


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