The aftermath of the nuclear holocaust on the earth caused many geographic changes to all seven of the continents. Land masses moved, rivers changed their course and mountains arose where previous only hills existed. While the Sanctuaries were mostly immune to these geographic shifts, the land changed in other ways. The mighty river which split the Five Kingdoms into two distinct areas was now a large Inland Sea. This separation caused not only a physical slit in the land, but a split among the people of the Kingdoms as well.
Originally the people housed in the Central Valley Pinnacle were genetically close to Northern and Southerns. All had common ancestors from the old world from the First Families of North American. The major differences would not begin to surface until many generations had already been raised. Differences in physical changes were few, but major differences came through in their philosophy.
For centuries since the rebirth, the four contiguous Kingdoms began to share opinions in the important area of what direction the remnant of humanity should take to rebuild and repopulate the planet. Prior to the desecration there were close to 8 billion humans crawling across the face of the earth. The first estimate placed the Creator's children after the holocaust at around 140,000. That did not count people groups such as the Northerners who had no regard for the Druids or their creations and had not participated in the Sanctuaries, preferring instead to trust their own histories for survival.
Divided from their fifth brother by miles of turbulent water, the Four Kingdoms learn to trade and band together as a four pronged unit. Now the Eastern Kingdom stands alone from the others, unsure of their place in this alliance and highly distrustful of the new young queen of the West and her supposed 'witch' powers. That caution will become fodder for those who seek to destroy the fragile evolution of humanities' regeneration.