National observance of the 100th Anniversary of America's entry into World War I on April 6, 1917

The nation today officially commemorates the 100th anniversary of U.S. involvement in World War I.

Visit New York State's 100th Anniversary Centennial Website.

Read more from USA Today, "What you need to know about Thursday's World War I Centennial event"

And visit the National World War Museum and Memorial HERE.