So what historical links does your fictional world commemorate/prefer to forget and why? What stories does it tell the truth on and which does it cover up? What happens to those who don't "buy into" the official historical line? Does the society you've created treat history as important or is it just saved for the tourist industry?
What links do your characters have to historical events? Are there special ceremonies to commemorate specific events? Are historians free to write up their own thoughts on the past or are they expected to toe the government line?
History also has a habit of coming back to haunt people so how is this portrayed in what you write? And what do the people/characters concerned do to try to stop/overcome this?