>>512038792
Ultimately, the groups you mentioned all combined to form the current European race.

Here is the thing though, all of these ancestral European populations had their origins in a recent common ancestor. This makes them genetically compatible. So when a blond Dane Viking invades the UK, the genetic product still falls within the boundaries of the European cluster defined in the pic attached to >>512036297

Now consider two incompatible races - a very good example is Dalits and Indo-Europeans. They share no recent common ancestor. The genetic combination is chaos.

Look at the spread of the CS_Asians in >>512036297

What is interesting is that after a period of intense race mixing, (picrel) , evolutionary forces created a class system (the scientific word is endogamy - fun to look up) to try and recover to some form of homogenous race.

Evolution creates races.

Maybe in another 100 000 years the SE Asians will recover. Until then, their mean IQ is riduclously low and they will never be a first world.