The in-game manual has decent info for new people and all that, and I guess I'm new to Supremacy 1, somewhat S1914, but I feel like in the Advanced Tab there should be a section that informs the players over AI. Since Call of War and S1914 all adopted Elite AI into the base of the game, that's what I'm assuming is in Supremacy 1, AI can obviously put a trade embargo on players, and ever declare war on them. I just think that having a section about your "Popularity" and the effects of it, how to increase it would be good. I don't think someone randomly seeing 3 AI countries have declared war overnight would be a good sight (without knowing why).
Also just a side thought I had now, can you still get Right of War with AI? There's lots of neutral roads, but they don't go across the world and all, just a thought.