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The United States did not know about it in 1941
The United States froze the Germans assets in June 1941. The Italians assets were also frozen in June 1941. In July 1941, Japan had their assets frozen.
US, Britain, France, Japan were in alliance with the United States of America from 1920-1941. They called that alliance the "Four Power" Agreement and they came to agreement in 1922.
United States Ambassador to Iceland was created in 1941.
The United States entered World War II after the Japanese attack on Pearl Harbour on 7th December 1941. The US declared war on the following day, 8th December 1941.
The United States was attacked by Japan in December, 1941.
The United States declared war on Japan December 8 , 1941 .
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The President of the United States when Germany declared war on the United States in December 1941 was Franklin D. Roosevelt, who, eight years into his term as President, assisted the United States to a rapid economic recovery.
It brought the United States out of neutrality.
Germany declared war on the United States on 11 December 1941 and the US responded accordingly.
At the beginning of WWII, America was neutral. The US did not enter the war until 1941, after the attack on Pearl Harbor.