These core regions had all been fairly typical of the relatively warm, habitable regions during the Ice Age, but they now grew increasingly distinct, both from the rest of the world and from one another. Geography had favored them all, but had favored some more than others. One core, the so-called Hilly Flanks in western Eurasia, had uniquely dense concentrations of domesticable plants and animals; and since groups of people are all much the same, it was here, where resources were richest and the process easiest, that moves toward domestication began. That was around 9500 BCE.
