Barry--RACE is a social/political construct. My family IS Native American. I have recently done a lot of digging into our history. I have read years worth of census----they are listed as caucasian. Some of them are also on the Cherokee rolls. There is no such thing as a 'mongol' race---there is no scientific designation. Where does the 'mongol' race end and the 'caucasian' race begin? And who says so?
Do people have lines drawn in the soil to designate what race would be born where? Do you think you come up to a line in the sand, and suddenly the skin goes from brown to white? Seriously? If you take people from opposite ends of the spectrum, perhaps you will see a greater difference. But if you travel throughout the continents, you won't find it. The change will be so gradual and subtle, that you will not get to draw your arbitrary line. The line is subjective and quite often political.
Australia and the Americas were populated much later---so it is true that the gene pool from which their populations drew was smaller. But again--RACE? Well it just depends on how far back you are testing in that genetic history---as it all goes back to Africa. So at some arbitrary point, SOMEBODY decided, okay now this is 'mongol'. We won't go back any further than that.
There is no such thing as 100% mongol.
NC