-Nations are made up of people, people who have their own desires, culture, history, societal cohesion, values, motivations, etc. With the end of the feudal system, governments could no longer be force the people to do anything the king/emperor/oligarchy wanted done; the people had to be manipulated and not all goals could be accomplished. Few governments have the capacity to motivate a nation into an unprovoked, conventional, conquering, subjugating, exploiting war and many historians can attest to the presence of a "right mix" of circumstances which allowed the governments of Germany, Italy, and Japan to lead their nations to do just that.
-Since it would be difficult and tedious to model this politicking into a strategy "war" game the abstraction is what you get instead. An improper game abstraction would be to permit you as a sovereign leader (elected or pseudo-elected) to arbitrarily mobilize any nation to war against any other nation for no reason other than "Germany and Japan are doing it". A system built on "I want to do what I want, when I want, with whatever nation I want) is so far from even coming close to the process for leading a nation to war that it's silly to even think about it that way (yes, that's what Hitler did, but can't you see that's the exception to the rule because of the circumstances which put him in power). You can't run Chile or India like Germany, the people of those nations would have never stood for it. A-historical shouldn't mean completely contrary to what was even remotely possible.
-This isn't Risk.
-Rules or game mechanics clarifications, yes, I like those too, especially in a single source, downloadable, "official" format. JMHO
The Marshal