December 11, 1941, the United States Congress declared war upon Germany (Pub.L. 77–331, Sess. 1, ch. 564, 55 Stat. 796), hours after Germany declared war on the United States after the Japanese attack on Pearl Harbor. The vote was 88–0 in the Senate and 393–0 in the House.
Seventy-Seventh Congress of the United States of America; At the First Session Begun and held at the City of Washington, on Friday, the third day of January, 1941.
JOINT RESOLUTION Declaring That a State of War Exists Between The Government of Germany and the Government and the People of the United States and Making Provisions To Prosecute The Same
Whereas the Government of Germany has formally declared war against the Government and the people of the United States of America: Therefore be it Resolved by the Senate and House of Representatives of the United States of America in Congress assembled, That the state of war between the United States and the Government of Germany which has thus been thrust upon the United States is hereby formally declared; and the President is hereby authorized and directed to employ the entire naval and military forces of the United States and the resources of the Government to carry on war against the Government of Germany; and, to bring the conflict to a successful termination, all of the resources of the country are hereby pledged by the Congress of the United States.
(Signed) Sam Rayburn, Speaker of the House of Representatives
(Signed) H. A. Wallace, Vice President of the United States and President of the Senate
Approved December 11, 1941 3:05 PM E.S.T.
(Signed) Franklin D. Roosevelt