100 years ago, on April 6th 1917, the United States declared war on Germany and officially entered the first World War. http://histv.co/2oMYF1l | HISTORY

On the 11th hour of the 11th day of the 11th month, 1918, an initial agreement to end one of the world's deadliest conflicts was signed. World War I led to the death of millions of people, involved 40 countries — and it destroyed Europe. | DW News