The in-group racial preference is innate in the human experience; it cannot be refined. American Negroes have an in-group preference, and this seems true of various religious groups by definition. European people, for some inexplicable reason, do not have an innate in-group preference or even identify with each other to any significant degree. Part of this is because two world wars utterly discredited, in the eyes of the elites, nationalism. Much of the nationalism we know today actually has its origins in the liberal nationalism which resulted in the 1848 revolutions and attempted overthrow of the European monarchies. In my country, liberals were at the forefront of eugenics as they believed producing a pure, undiluted race was integral to social progress.
The dilution of the European identity through mass migration and a sustained campaign of denigration and self-criticism has produced a self-fellating race that prostrates itself at the heels of people who were once their inferiors, both in an economic and political sense.
However, I think Jews are the ones who most keenly feel kinship with their racial brethren. Aside from them, probably Muslims, for purely religious reasons.