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Because The Japanese attacked them at Pearl Harbor on December 7th, 1941. :)

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13y ago

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Related Questions

What side joined the US?

allies


When did the US enter World War 1 with Allies?

The US joined the war on the side of the Allies on April 6, 1917.


What was the chief result of U.S. participation in World War 1?

After the US joined WWI, the allies had the forces they need to triumph. The axis powers fell and the war ended.


Were the Arabs US allies in world war 2?

Saudi Arabia joined the Allies on 1 March 1945.


What was the type of allies that the US joined during world war 1?

The Germans


What effect did the US have on World War 1 when joining in to fight with the Allies?

Germany tried keeping the US out of the war in England by bribing Mexico with states like Arizona, New Mexico, and Texas, which were former Mexican Territories. Germany knew that when the US joined the allies that they would in sense "clean house." In 1917, when the US joined the Allies, the allies forced Germany and Austria-Hungary to give up.


What was Mussolini's global impact?

He joined forces with Germany in WWII against the US and allies


Did the US fight with Hitler to defeat England in world wars two?

No. The US fought against Hitler. We were allies of the UK.


What was the US influence in World War 2?

The US gave the Allies a fresh army. Right after the US joined Russia dropped out. This gave the Allies a dominant chance to win. Without the US, Russia could have stayed and finished off the Allies without the US.


Explain why US joined the war on the side of the Allies?

The united states joined the war because Germany sank the famous ship the Luistania (killing hundeds of Americans) and cargo ships with submarines. The u.s. joined the allies because they were fighting the Germans.


What would happen if Japan didn't bomb pearl Harbor?

US wouldn't have joined the Allies in WW2 and the Allies would have probably lost.


Which country remained neutral until it joined the Allies in 1915?

The good ole USA