You also don't need to go back very far in history to see how white patriarchal empires dominated/shaped most (all?) of these regions and countries for centuries.
I would submit, that white patriarchal opinion is due to the time period you are sampling coupled with,in this case, mobility by boat to allow a more global reach.
There were Mongols, Kush / Egyptian in Africa, Inca, Navajo in North America, etc etc - pulling from large and small groups. Even within a group, the India Caste system did the same within a population
There were Mongols, Kush / Egyptian in Africa, Inca, Navajo in North America, etc etc - pulling from large and small groups. Even within a group, the India Caste system did the same within a population