<you mean something that erase unused history from the last 300 years? That'd be an idea...
I always wondered why the game saves such informations. They seam never used in game.![]()
AFAIK, it's used for that after-game history breakdown of your nation, ex. "In 1489, we successfully defended against the second Ottoman-Wallachia War of aggression" or however that goes.
But overall, I think that after-game breakdown has never been of any use for me so I really wouldn't care if it was taken out.