The reason that the Powers that Be caused thechange was to prevent Second Impact from occuring. We know from what the Wicca Hecate trio told Rudi, plus some of his visions earlier in the books, that the earth was headed towards a bad future before the change. the Hecate trio tell Rudi that they had a handle on most of these futures, but that some were beyond what they could prevent, so they had to create the change to stop them. Since the change occured before 2000, and because this is the WMG section, I say that they made the change to stop SELEE from initiating Second Impact. Discuss. Also, anyone that could make the title work, feel free to help me there.
Factions of The Mindare responsible for all of Stirling's alternate Earths. Draka Earth: Completely unbelievable? No! Dead Nazi Gods covertly backed that timeline. Peshawar Lancers? The comet and the psychics were arranged by a nihilist faction that influence Russia, but Victoria-fans managed to save civilization. Conquistador? That one is William Walker's personal project.
Swindapa and Marian first met after their deaths in the original timeline.They picked Nantucket to send back partly so aspects of themselves could meet while alive.
Rudi won't leave an heir.Rudi and Mathilda have decided to wait until after the epic continent-wide war against the demon worshipers is finished to have children. Makes sense, right? Mathilda getting pregnant during the war would not only be dangerous for her, but would take a skilled fighter out of the battle and endanger everyone. So everyone's planning on them estabilishing a dynasty after the war and uniting everything west of the Cascades. Except that Rudi is fated to die in battle, and therefore before he has children. There'll be no heir tying all the kingdoms together, and eventually Mathilda's mother will try to conquer the west through force instead of marriage. With or without the cooperation of Mathilda, who wouldn't have any ties left to the other kingdoms.
What's going on with 'giving humanity time' isn't a straightforward The World Is Not ReadyIt's not really clear how sending civilization back for another go-round is going to help avert the bad futures seen (which seem to be some sort of ultra greenhouse effect and the replacement of humanity with other sorts of intelligences, possibly AI or radical transhumans) ... unless Rudi's visions of them become widely known and widely believed, and remembered and still believed centuries later, which doesn't seem all that likely (as he doesn't seem to be publicizing them - though perhaps he might after the immediate CUT crisis is resolved). So maybe what's really going on is more of a subtle "butterfly effect" push. Perhaps the very existence of the Change - a massive, universal event which really looks supernatural - as something which will be pretty much undeniable in history even centuries to millennia later will mean that belief in the supernatural never becomes less common (or relevant to everyday life) as technology advances again, changing humanity's attitude toward science (and therefore technology) in perhaps subtle but crucial ways.
The Mind DID change the laws of physics...in such a way that the laws of physics are no longer straightforward mathematical equations that apply everywhere in the universe. Occam's Razor no longer applies; instead, the laws of physics have become full of stipulations and conditions - complicated "computer algorithms" in a way rather than simple equations.