Which preposition to use with mongolians

in Occurrences 1%

To aliens, in the third hand, we have been consistently generous, having shown only in the very last few years any attempt whatever to exclude the most worthless or undesirable; except that the prejudice against the Mongolian in the far West is quite as bitter as it ever was against the negro in the South, and he is still sternly refused citizenship, even national citizenship, which we freely extend to the African.

with Occurrences 1%

The average colonist regards a Mongolian with repulsion, a Negro with contempt, and looks on an Australian black as very near to a wild beast; but he likes the Maoris, and is sorry that they are dying out.

Which preposition to use with  mongolians