On April 6, 1917, the United States officially entered World War I, a war that changed the nation and the world forever.

You can watch the live stream of “In Sacrifice for Liberty and Peace: Centennial Commemoration of the U. S. Entry into World War I” ceremony, hosted by the World War One Centennial Commission at the National World War I Museum and  Memorial in Kansas City, Missouri beginning at 9 a.m.

http://www.worldwar1centennial.org/index.php/sacrifice-about.html

The 90 minute, international ceremony will consist of readings from speeches, journalism, literature, and poetry by invited readers.  There will be performance of music of the time, military bands, color guards, and flyovers by U.S. and French military aircraft.  If you are able, it will be worth watching.  (C-Span and other TV networks may also cover the event, but I have not found the listings.)