I've spent a good forty years of my life in Africa. It is a continent of violence, and it always has been. There is a lot of genocide in Africa. That's because some tribes seek dominance.

South Africa has been described as the most violent country in the world outside an active war zone. Black men rape babies in order to cure themselves of HIV/Aids. It has been estimated that something like 40% of South African women have been raped.

Shamans freely advertise for bodily parts of humans. Testicles are in high demand. These practices are thousands of years old. They have not disappeared.

So when you say, "There is no doubt that all countries of the “Old World” privilege people of their own country, especially those who speak their native language," I must say that it happened and still happens in the 'new world.'

Humankind can be pretty violent.

With regard to slavery, it is as old as the hills. It has been in just about every culture that has ever existed. The bible speaks freely of slavery in the old testament. Both Rome and Greeks had slaves. So did the Chinese. India has a caste culture, so people are born at the bottom of the rung, and they stay there.

In Africa, when tribes fought, the victors would take captives and sell them to slave ships. Africans still own slaves in Africa.

https://www.walkfree.org/global-slavery-index/findings/regional-findings/africa/

You say, "It tells us—not unlike the Nazis—that if you are not white, Aryan, and blue eyed, you are inferior. Maybe they won’t say so overtly, but it’s very obvious in their actions."

I think that's a misinterpretation. Most people are tribal - they reject anyone who is not like them. That they are a different race, I think, may only be incidental.

Might I ask you where you get your data that whites are treated like royalty in Japan? I might be missing something here.