Here’s Dr. Megan Kate Nelson giving a really good lecture on the Civil War in the Far West, which, I should point out, Megan, is actually a part of the Trans-Mississippi, not separate from it. 🙂
The video’s description reads, “Historian Megan Kate Nelson looked at how the Civil War impacted the American West as the Union and Confederate armies fought for control of the territory.”
I’m looking forward to reading this book.
Student of the American Civil War 
I am currently reading Dr. Nelson’s book and enjoying it very much. Highly recommended, especially for those interested in New Mexico and its cultures.