I think this eliminates much of what you learn from history when you study it. Knowing what lead into WW1 and WW2 spanned for decades before, and were much more important than learning the actual facts of the war. History isn't really the study of what happened, rather it's the study of the consequences of what happened. Going in chronological order gives you a sense of what to expect based off what is happening.

This is worse, this will present the subject as a stand alone manifestation, instead as a part of a continuum.