Why did Germany and Italy declare war at the same time the US declared was on japan?

Answer 1

The United States went to war with Japan because of their attack on Pearl Harbor on Dec. 7, 1941. The U.S. was more or less expecting war with Japan at some point, but not at the time and place the war began.

After President Roosevelt's speech to Congress on Dec. 8, 1941; Congress declared war on Japan. The 470 for and 1 against (the sole vote against came from a profound pacifist Representative. She later voted for war against Germany and Italy [or was not present during those votes]).

The United States went to war with Germany after Germany declared war on the United States on Dec. 11, 1941. The Congressional vote for this declaration was unanimous.

Answer 2

Japan and Germany were the two great fascist powers in WW II (with Italy coming up third) and both of these countries were at war with Britain (Japan attacked the British colony of Hong Kong). The US had already been through WW I as an ally of Britain, and was very close, culturally and economically, to Britain and to other countries that were allied to Britain, Canada in particular. Even though Germany and Japan were not formally allied, they did see themselves as being at least allies of convenience, since they had common enemies. Therefore it made military sense for the US to go to war with both Imperial Japan and the Third Reich. Aside from that, the US did not really want to see the continent of Europe ruled by a vicious and ruthless Dictatorship, which sooner or later might turn its attention to the US.

Answer 3

Germany and Italy were honoring the non-aggression pact that they had signed with Japan .