That is the sort of horrible simplification that "scientific racists" must make to justify the concept of "race".
Good one, Stolfi. You're way more fringe leftist than I imagined, trying to claim that anyone acknolwedging different ethnic groups or races exist at all is a "scientific racist". The word "racist" isn't even a valid word in the first place because it implies everyone on earth is identical to one another.
Read it and weep you anti-Bitcoin Marxist:
https://en.wikipedia.org/wiki/Mainstream_Science_on_IntelligenceNo scientific evidence exists whatsoever to back up your points, none. The only evidence that exists points to the opposite of what you claim, because all that matters is the bell curve, not outliers.
(The term "Caucasian", by the way, is a relic from "scientific" racial classifications of the 19th century.)
Oh joy, now anyone filling in the word "caucasian" for race on the census is now a "19th century racist". You are a true self hating, far leftist, anti-white racist yourself posting garbage like this. You're not allowed to be a Caucasian because "Caucasian" is a relic, hence bad! Nobody on earth is allowed to be different from one another. Everyone must be identical, Marxism commands it! Also, reject Bitcoin, worship fiat!
There are known natural mechanisms that allow such jumping, and they have been adapted for genetic engineering. Again, it if such accident happens only once in a million years, that may be sufficient to transfer a gene from one to all individuals of a completely different species.)
Probably mutation + convergent evolution, which is why if life is discovered on other planets, it would likely be similar to what exists here or in the past.
In cultures that did not have African slavery for many centuries, or which for some reason never adopted the "one drop rule", skin color is perceived as a continuous variable that is either irrelevant, or does not trigger discrimination at some magic level.
Please cut the slavery BS. Brazil didn't even get rid of slavery completely until TWENTY FIVE YEARS after the emancipation proclamation in the US. Hilarious that you would actually bring this up while trying to demonize North America. The Roman empire also had more white slaves than black slaves ever to exist. Anyone trying to play the slavery card is a pathetic propagandist. The basis of the so called "one drop rule" was most likely due to white genes being recessive.
The natural order of human grouping is individual > family > tribe/village > city state of ethnocentric majority
Without an ethnocentric majority, the nation state collapses. Every country on earth that doesn't collapse enacts similar policy, such as the Japanese attempt to regulate immigration and maintain their demographic. The US had the same laws until Jewish lobbyists got the immigration act of 1965 thrown away. They wanted their diaspora from all over the globe to be allowed in, and they see homogenous civilizations as a threat to their existence. There's a reason places like China (the Han) and Japan have existed for so long, because they're mostly homogenous civilizations. America will inevitably implode because Marxists constantly try to push the lie that "diversity is strength", when it's actually a weakness that causes social unrest and implosion.