September 2, 1945.
The United States Congress officially declared war on Germany on April 6, 1917. President Woodrow Wilson asked for a declaration on April 2.
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The United States was bombed by the Japanese at Pearl Harbor which cause a declaration of war but Germany had an alliance with Japan and it had forced the United States to declare war on Germany too. Then Germany had an alliance with Italy which cause the United States to declare war on yet another country. Then the world was at war and therefore World War 2 started.
The United States officially declared war on Japan and Germany in December 1941. However the United States had been helping the British with armament and trade goods covertly for a couple of years prior to actually entering the war officially.
On April 6, 1917 (during World War I) the United States Congress declared war upon the German Empire. In December of 1941 (during World War II), it was actually Germany and its Axis partners who declared war on the United States. This was after the bombing of Pearl Harbor and the subsequent declaration of war upon Japan by the United States.
Different countries do it in different ways. In the US, only Congress can do it- but the Constitution doesn't specify exactly how, so it's always been done basically like passing a law. In countries that have a monarch, like Britain or Japan (before World War II), that monarch has the sole power to declare war, but they usually consult their advisors before doing so.
Japan bombed the US Naval Fleet in Pearl Harbor, Hawaii on December 7th, 1941. This caused the US to declare war on Japan the next day. This officially put the US into World War 2. The day after that, the United States declared war on Germany.
The Japanese attacked Pearl Harbor, and the United States entered World War II. They were involved previous to the attack, but they were officially fighting then.
Japan bombed Pearl Harbor, Hawaii on December 7th in 1941 and World War 2 officially started for the United States.
Answer this question… Germany's pact with Japan caused it to declare war on the United States.
Yes they did. Twice.Actually, I believe Germany technically declared war on the US during the second world war (1941).