The Chrono-Spell project was a success. Clover the Clever sent Star Swirl the Bearded back in time, where he erased the Windigoes from existence before they could descend upon the three tribes.
Without a common foe to unite them, the three tribes remain separate, continuing to grow and expand in an era of prosperity. However, the conflicts between the three tribes remain and continue to fester until they reach a boiling point.

Finally, the turning point is reached and crossed. Three tribes that could once have been united...
Now prepare to go to war.