Looking for my next civil war book

Looking for suggestions from folks. I’m wrapping up EriK Larson’s The Demon of Unrest. I really like the book and I know it’s going to leave off where I’d like to know more about the civil war. The period of time following for sumtner. Interested to see how the union organized itself, political infighting, the course of events that followed, the south’s mobilization etc. any suggestions would be greatly appreciated.