After Japan attcked Pearl Harbor we declared war of Japan, and Germany.
Japan, Dec 7, 1941 (state of war existed); Dec 8, 1941 US declaration of war against Japan; Germany declared war on US December 11, 1941.
Following the attack on Pearl Harbor on December 7, 1941, the United States declared war on Japan. Because Germany and Japan were in an alliance, Germany then declared war on the US. The United States, in turn, declared war on Germany.
After the US declared war on Japan because of Pearl Harbor Germany/Italy in turn declared war on the US.
The US declared war on Germany on Dec 11th 1941, (two days after Germany declared war on the US). Everything since that date to the present is after.
He is the man responsible for USA entering WW1. He sent a telegram to Mexico promising them American land that they lost in the Spanish-American War if they allied with Germany in case the USA declared war against Germany.
1914
President William McKinley declared war against Spain on June 26,1898. This then became known as the Spanish American war.
President Franklin Delano Roosevelt was president when World War II began.
Because the United States had declared war on Japan, Germany's ally.
Germany was allied with Austria-Hungary when the Serbian's assassinated Archduke Franz Ferdinand (of Austria Hungary). As soon as Austria-Hungary declared war on Serbia, Germany was obligated to declare war as well but the fact that German Unification had allowed for Germany to become such a military powerhouse gave the German's a bit more confidence than they should have had. Germany took over the war against Serbia and declared war on more countries as global leaders sided with Serbia. This aggression from Germany took this war to the global scale.
Germany declared war on the US on 11 December 1941. In the hopes that Japan would declare war on Russia.