USA HISTORY

Detailed explanation-1: -World War I, also called First World War or Great War, an international conflict that in 1914–18 embroiled most of the nations of Europe along with Russia, the United States, the Middle East, and other regions.

Detailed explanation-2: -World War I was known as the Great War, or the World War, until World War II broke out.

Detailed explanation-3: -’Great War’ was the most commonly used name for the First World War at the time, although ‘European War’ was also sometimes used. As the first pan-European War since Napoleon, ‘Great’ simply indicated the enormous scale of the conflict, much as we might today talk of a ‘great storm’ or a ‘great flood’.