The U.S. declaration of war on Germany in December 1941 was primarily precipitated by the Japanese attack on Pearl Harbor on December 7, which led to the U.S. entering World War II. Following this attack, Germany declared war on the United States on December 11, 1941, prompting the U.S. to respond in kind. Additionally, the growing threat of Axis powers and Germany's aggressive military campaigns in Europe contributed to the urgency for the U.S. to formally engage in the conflict.
The Zimmerman Telegram and hundred of American ships being sunk by German submarines led to the U.S declaration of war on Germany.
Germany declared war on the US on 11 December 1941
They didn't have to. On 11 December 1941, Germany declared war on the US.
On 7 December 1941, Japanese forces attacked US military installations at Pearl Harbour on Hawaii. On 11 December 1941, Germany declared war on the US.
The Axis forces led by Nazi Germany, and Japan after they entered the war in December 1941
The United States entered World War II on December 7, 1941, following the surprise attack by Japan on Pearl Harbor, Hawaii. This attack led to a declaration of war against Japan on December 8, 1941. Subsequently, Germany and Italy declared war on the U.S. on December 11, 1941, prompting the U.S. to enter the conflict on both the Pacific and European fronts.
The German invasion of Poland on 1 September 1939
Britain's declaration of war on Nazi Germany led to the Canadian Corps' involvement. So technically, Canada declared war on Nazi Germany.
Mainly Pearl Harbor because Japan was an ally of Germany. After Pearl Harbor was bombed the US declard war on Japan and because they were allies Germany and Italy see it fit to declare war on the US.
America did not start WW2, Germany and Japan get the credit for that. The US did declare war on Japan on 08 December 1941, after the Japanese bombing of Pearl Harbor, and 11 December 1941 on Germany, being allied with Japan.
The Soviet Union became an Allied country when it was invaded by Germany on June 22, 1941. Germany and Italy declared war on the US on December 11, 1941; three days after the US declaration of war against their ally Japan. However, the Soviet Union did not move against Japan until near the end of the war, and only then because the US required it in return for Soviet territorial demands in Eastern Europe.