I think the history of all notifications, results of battles, elections and so on will be very useful and interesting. It will be especially interesting to watch the story at the end of the game or analyze previous battles to choose tactics in the current battles. The history should have sorting and filtering of notifications. Also, this history can be stored in the results of the game (in statistics). A similar feature is available in the games of the Total War series and it looks quite interesting there).

Oh! A very interesting suggestion. Maybe you can make an idea (into ideas section) of it. If you do, PM me and remeber to vote!