There were many events that took place that lead to the US declaring war on Germany. These events include the sinking of the Lusitania in 1915 and the telegram that Zimmerman sent to Mexico by Germany in 1917.
Britain had a treaty to protect the neutrality of Belgium.
The German telegram to Mexico and the sinking of U.S. merchant ships.
yes because they where in the middle of war.When Austria-Hungary was threatening to invade Serbia, the leadership of the German Empire favored such an attack but did not want it to lead to a general European war. When AH did, indeed, attack Serbia and the Russian Empire responded by declaring war on AH, Germany responded by declaring war on Russia. Within days, Germany also declared war on France and Belgium.It does not seem that the German Empire made much effort to remain neutral.
America declaring war on Nazi Germany and joining the Second World War in Europe.
mobilization
it became global
it became global
Germany declared war on Poland, which led to England and France declaring war on Germany.
Russia declaring war on Germany to protect its ally Serbia.
At the start of the US involvement in WW II, the US was attacked by the Japanese. When the US declared that a state of war existed between the US and Japan, Germany declared war on the US. Your question should be was Germany justified in declaring war on the US.
Transformed peacetime industries into war industries