Knowing that japan attacks the u. s at pearl harbor , explain how "m. a.i. n" started anothee war

M.A.I.N is an acronym for Militarism, Alliances, Imperialism and Nationalism. Militarism was one of the major causes. Military competition played an important role in the “arms race” in European powers. Building a stronger military was a policy within neighboring countries. With the Alliance system countries pretended to maintain a balance of power. It was thought that alliances would promote peace Imperialism also promoted the war since competition for lands caused confrontations and conflicts. Nationalism was based on the belief that one’s nation was superior to the others.  

very carefuly thats what i say