Having read Volumes 1-3 a while ago, I’d forgotten a lot of it but Volume 4 recaps quite well. This political tale of the machinations between the global powers on a futuristic different Earth is quite involved and it is well worth while reading the first three volumes to get a grip on this collection. However the story is still confusing for me after such a long time.
The Endless Nation conquer the Texas Republic. Alliances are formed. The second part deals with the development of Babylon, influenced by Balloon and the prophet Orion.
This is an enjoyable read and nicely illustrated.