1917The United States declared war on the German government, ending its neutral stance and formally joining World War I.Events & Anniversaries, World Events

The President signed the War Act on April 6, 1917.
Gloucester Daily Times. “President Signed the War Act at 1.33 This Afternoon.” April 6, 1917, Vol. 53 No. 8529 edition. https://sawyer.advantage-preservation.com/.