U.S. President Woodrow Wilson outlined the case for declaring war upon Germany in a speech to the joint houses of Congress on 2 April 1917.
This document is the formal declaration of war which followed four days later, on 6 April 1917.
200224Formal U.S. Declaration of War with Germany, 6 April 1917United States Congress
Joint Resolution Declaring that a state of war exists between the Imperial German Government and the Government and the people of the United States and making provision to prosecute the same.
Whereas the Imperial German Government has committed repeated acts of war against the Government and the people of the United States of America; Therefore be it Resolved by the Senate and the House of Representatives of the United States of America in Congress Assembled, that the state of war between the United States and the Imperial German Government which has thus been thrust upon the United States is hereby formally declared; and that the President be, and he 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 Imperial German Government; 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.
Speaker of the House of Representatives
THOS. R. MARSHALL
Vice President of the United States and President of the Senate