University of South Florida
Teacher's Guide to the Holocaust: German Declaration of War With the Us
The text of the German declaration of war on the United States on December 11, 1941, following the US declaration of war on Japan.
The History Place
The History Place: German Declaration of War
This site from The History Place contains the text of the German Declaration of War against the United States. The information is somewhat brief, but link are provided to additional information.
Other
University of West England: German Proclamation on War With Ussr: June 22, 1941
Resource includes the text to Adolf Hitler's speech to the German people declaring war against Russia in 1941.