I think focusing on race/ethnicity is probably quite an unreliable way of ascertaining a country/regions' history over a long period of time. The racial demographics of a nation can change dramatically in a very short period of time, a race can go from being the majority to being the minority in as little as a generation, and that's just as a result of gradual and constant movements of ethnic aliens into a region over several decades. This sort of demographic shift is happening in places like the UK, US and much of Western Europe at a very fast rate really.
People tend to make the general assumption that the majority race in almost any given country (with the obvious exception of countries like the US or Australia) today has ALWAYS been the majority for thousands of years or what ever, when in reality considering the speed with which demographic shifts occur, observably so in the present day, it seems illogical to assume say the mongoloid Chinese today were exactly the same people even a few hundred years ago, let alone thousands of years ago.
People tend to make the general assumption that the majority race in almost any given country (with the obvious exception of countries like the US or Australia) today has ALWAYS been the majority for thousands of years or what ever, when in reality considering the speed with which demographic shifts occur, observably so in the present day, it seems illogical to assume say the mongoloid Chinese today were exactly the same people even a few hundred years ago, let alone thousands of years ago.