WW 1 was a century ago, that was when it started.
I know we refer to the Great War 1914-1918 as WWI and what the Russians call The Great Patriotic War as WWII.
There has been a World War raging since 622 A.D.
Islam has been at war with everyone else since its inception.
The U.S. first foreign war after Independence was against muslims, the Barbary Pirates.
There can be no peace until there is only Islam or no Islam, their book and prophet commands it so.