What war was called the "great war"? world war ii sino-japanese war world war i the cold war?

The "Great War" was commonly known as World War I, as it was the first war to truly incorporate almost all the nations in the world. It was also classified with the name Great, because it was fought on multiple fronts, and the technology as well as military organization allowed the war to be more damaging to all participants.

~

#1 im pretty sure its a.