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From March, 1941 the United States of America was openly giving aid to the UK in the guise of the Lend Lease Scheme.

As early as September 13th, 1941 US ships and aeroplanes were assisting the UK with protecting the Atlantic convoys. Unofficially they were now at war with Germany.

In December 7th, 1941 the Japanese Imperial Navy launched an attack on Pearl Harbour along with other targets. This act is seen as the official start of US involvement in the war.

The USA officially declared war on Japan on the December 8th, 1941. 3 days later declared war on Germany and Italy and on June 5th, 1942 declared was on Bulgaria, Hungary and Romania.

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Q: When did United States join the World War 2?
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When did the United states join the allies in World War 1?

1914


When did the United States officially join in to World War 1?

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When did the United States join World War 1?

April 6th, 1917


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What year did united States join world war 2?

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The sinking of the Lucitania was the event that made the United States join World War 1


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The United States of America joined the Allied Nations in World War II.


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The United States did not join the League of Nations after World War I.


What major Allied power refused to join the League of Nations following the end of World War 1?

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Why was the zimmerman telegram important in world war 1?

The Zimmerman telegram was published in the United States on March 1, 1917. It was a coded telegram asking Mexico to join Germany's side on World War I and Germany promised that if they join them that they would get their lost and back from the United States. Here is what they lost to the United States: New Mexico, Arizona and Texas. The zimmerman Telegram was the last straw for the United State and on April 6, 1917 the United States declared war on Germany.


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