100 years ago today (April 6th) the United States entered World War I

6

https://en.wikipedia.org/wiki/American_entry_into_World_War_I

http://www.history.com/this-day-in-history/u-s-enters-world-war-i

On April 6, 1917, two days after the U.S. Senate votes 82 to 6 to declare war against Germany, the U.S. House of Representatives endorses the decision by a vote of 373 to 50, and the United States formally enters the First World War.

Nasty world out there.