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America was helping Britain on the quiet, using lease lend of ships in return for America being allowed to gain bases on British controlled countries. It was the Japanese attack on Pearl Harbour that brought America to declare war on Japan. Then Germany, as an ally of Japan, also declared war on America. This brought America directly into becoming a member of the Allied forces and to help fight against Germany and Japan. It was the industrial might and vast manpower of America that swung the tide against Nazis Germany and Japan's aim of conquering large areas of the Earth.
Wiki User
∙ 6y ago
Wiki User
∙ 6y agoThe US was attacked by Japan. Shortly after that, Germany declared war on the US. Game on.
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What caused to us to enter world war 1?
Europe needed help and weapons
Which action caused the us to enter world war 2?
Japanese suprise attack on Pearl Harbor Hawaii on 07 Dec 1941
Why did US enter the world war 1 and when did they enter?
The USA joined in the war because the USA was part of the Triple alliance in the first place, and after Germany attacked the USA's submarines and battleships, they then joined the war in 1917.
Why did the us enter the world war 1 on the side of the allies?
The Germans sunk 7 US ships, and we intercepted a telegram from Germany that said they planned to attack us.
What were some of the post war problems that came about because of World War 1?
The Roarin' Twenties was right after the war... because doughboys (us soldiers) came back the Roarin' Twenties caused the Great Depression
What caused the US to enter the First World War?
the sinking of the ship lusitania:)
What occurred in Hawaii that caused the US to enter world war 2?
Pearl harbor.
What caused to us to enter world war 1?
Europe needed help and weapons
What caused the us to abandon their neutrality and enter World War 1?
US wanted to trade with the other countries causing them to get involved in the war
Want occurred in Hawaii that caused the US to enter world war 2?
They bomd pearl habor
What event finally caused the US to enter World War 2?
Japan bombing Pearl Harbor
What caused the US enter World War I?
when japan bombed hawaii that was the outrage that causedus to bomb them and then the us broke into world war 1 between japan and usa so suck it
Who caused the US to enter World War 2?
japan attacked u.s forces at pearl harbor hawaii.
What event caused the US to enter the combat of world war 2?
It started with the attack on Pearl Harbor in Hawaii
What battle caused the US to enter the World War 2?
The attack on the US naval base at Pearl Harbor, Hawaii, on December 7, 1941.
Which overt acts caused the US to enter World War 1 in 1917?
the sinking of the ship The Lusitania and the breaking of the Sussex pledge.
One reason the US did not enter World war 1?
The US did enter World War 1, though not till 1917.
