apr 6, 1917 - USA declare war on Germany
Description:
Germany's continuation of unrestricted submarine warfare and the British discovery the Zimmerman Note, in which Germany supported an invasion of the United States by Mexico, brings the United States into the war, and later, they would also declare war on Austria-Hungary, a close ally of Germany.Added to timeline:
Date:
apr 6, 1917
Now
~ 109 years ago