[quote=@Ezekiel]
<Snipped quote by Andreyich>

Simply whether I'd be able to rewrite some details of a nation's history, put different individuals in charge of nation and perhaps change their approach towards the other peoples of the world.

I.E. A more martial Ulthuan making greater attempts to reform their empire, etc.
[/quote]

If you generally keep on track of the original theme, yes. You can make your own King for the High Elves who is a great reformer introducing quasi-martial law and such. However, you can only change past events as recorded and presented by the High Elves, you can't actually change any pre-end times events if you understand what I mean (well, I would be willing for veeeeeeeeeeeeeeeeeeeeeeeeeeeery minor changes to history to occur, but it would have to be very well justified).