Rather than playing out all the wars, treaties, trade, and developments of every fantasy nation for every single year of its existence, the history of RRtK nations and their civilizations can be speeded up, generalized, summed up and brought into focus after a certain period of time in the future.
At the determined time, the History Continuance Phase, following RRtKV campaigning, nations consult the oracles, prophets, seers or augurs to determine the will of the gods and the course of future events. Whatever the diviners say, it certainly happens.
Based on what has transpired politically, socially, economically, and militarily in the world, an entirely new game of RRtKV campaigning begins again. The interval of evolved time is roughed out. The results will be like our present knowledge of ancient or dark age history; some years are detailed and in sharp focus while others are sketched broadly, or blurred.
A new map of the fantasy world is drawn up after determining what has occurred over the last 5 to 50 years.