That said, if you go through history, there has seldom been a time when one location or one state remained the dominant force in the world for more than 3 or 4 generations (especially looking at more recent world history). So, another way of posing the hypothesis might be: Is there a "migrant" sub-population within the human species that is both willing to travel to wherever opportunities are to be found and, at the same time, increase the prosperity of those locations when they arrive?