Mongoloid traits were part of the variability at the peopling of Eastern Asia and were gradually becoming more and more common on what we can largely consider a random (but maybe also sociological) evolution.

Many populations anyhow still display non-Mongoloid variability, and this is even more common in Native America, where actually Mongoloid traits are interwined in a complex network of many diverse ones, often non-Mongoloid. You just can’t tell me that, for example the nose of Evo Morales (a very typical Native American nose, specially in the Andes) is “Mongoloid” – it is not. There are many other such non-Mongoloid traits still surviving in Native America and also in parts of East Asia, notably SE Asia.

And, btw, very good point about the sample being awful. You can’t draw any conclusions based on such minimalistic local sample.