Definition.com
World War I (WWI) is often argued to have been an inevitable war that was mostly caused by the belligerence among the states, especially Germany.
World War I (WWI) is often argued to have been an inevitable war that was mostly caused by the belligerence among the states, especially Germany.

World War I (WWI) is often argued to have been an inadvertent war primarily caused by a security dilemma or a spiral.
Adolf Hitler wore his mustache in that fashion after shaving it to fit his gas mask in World War I