Originally Posted by 9/11-investigator
Motivation, as in what, exactly? That Austria-Hungary issued utterly unreasonable demands to Serbia in 1914, then declared war when Serbia refused, leading to a chain reaction of defensive alliances being activated?
What else? Japanese invaded China in 1937 (fighting began six years earlier) in an effort for an "East Asian Co-Prosperity Sphere", aka Japanese empire to replace European and American ones in the Pacific area. This led into a broad war in the Pacific, which was inherently connected to the war in Europe and North Africa. Nazi false flag operation on the Polish border and a subsequent invasion, that also led to a chain reaction of defensive alliances. What's there to write, all of this is pretty much indisputable.