Many of these thumbnail diagrams are analysis of famous landscape paintings by some of the most successful landscape artists. And then in the later part of the book, are color studies and painting examples by Edgar Payne. It is great to see how he explored color as a compositional aspect as much as he did the more structural underpinning of landscape compositions.
A common explanation is that the Civil War was fought over the moral issue of slavery. In fact, it was the economics of slavery and political control of that system that was central to the conflict. A key issue was states' rights. The Southern states wanted to assert their authority over the federal government so they could abolish federal laws they didn't support, especially laws interfering with the South's right to keep slaves and take them wherever they wished.
The Civil War was a contest marked by the ferocity and frequency of battle. Over four years, 237 named battles were fought, as were many more minor actions and skirmishes, which were often characterized by their bitter intensity and high casualties.