littlebabyjesus
one of Maxwell's demons
You're talking proximate and distal causes, essentially, and I go a distance with you on that. Sometimes the proximate cause is the powerful driver, though. So prejudice against immigrants occurs the world over, as I say, normally because the immigrant is from a poorer country - Haitians in the Dominican Republic, or North Koreans in South Korea.imperialism obviously isn't the whole story, although the nazi vilification of slavs (as preparation for setter-colonialism in eastern europe) didn't come from nowhere and isn't entirely unrelated, although it is also in the interest of the media barons to demonise minorities instead of the bourgeoisie, and to promote fascism instead paying slightly higher taxes on their inherited slave labour. I don't think racism as we talk about it is separable from colonialism, capitalism, imperialism, slavery, genocide (Japan, a fascist ethnostate, has many problems with racism particularly against those brutalised by the empire) although it has never been a consistent or coherent concept - the racial categories we think in terms of, similar to those on the census, would not exist without this history and there have been changes in who has been racialised as conditions have changed. Why do white people exist? I have asked this several times. White people obviously didn't exist in ancient greece, although the inferior races were easily identifiable by the fact that they were enslaved by or threatened the dominance of rich cunts like Plato. White people, as a master race, didn't exist before capitalism and the rise of the bourgeoisie (if they'd been black it would have been different obviously) and european colonialism, settler-colonialism in the americas in particular. White people are those not worthy of violence by their very nature (except as traitors or degenerates) this is why there are any white people. This is why the Iraq war is no big deal and supporters are still allowed to exist. Why British people love that evil genocidal turd Churchill. Why Trump won and why white liberals think Hillary is a progressive feminist. Why the white billionaire class has already chosen fascism and genocide as their solution to the human problem.
I think your take on ancient history is somewhat too rosy, though. You're right to see the roots of racism as we see it today in colonialism, but the 'othering' of the out group is something with as long a history as the history of humans. And the treating of a subjugated group as sub-human likewise. Spartans killing helots for sport, for example.