"The fact remains that with respect to the Civil War it is in my experience exceedingly rare to find a published article or text that, on the most controversial, hotly debated issues, does not lean one way or the other. That just seems to be the nature of historians who specialize in one or more facets of the CW."

Again I have to ask, what do you mean by "lean one way or the other"? If you look at the historiography of any Civil War subject, you will find numerous schools of thought.

Now, a key aspect of historical writing is a thesis. Published articles (at least academic articles) will often make arguments or interpret a topic a certain way. But these interpretations go all sorts of directions.

Could you give some examples of historians "lean[ing] one way or the other" in a simple "pro-Union" or "pro-Southern" way?