Clearly, IQ is decided entirely by race.
Nobody says that entirely (or even that mostly! - but to some extent, maybe) by race.
And by the way, there was an Afro-American genius girl with IQ of 200 - I'm sure she was smarter than all of us, members of this forum. The problem is, that, just
statistically, Afro-American IQs are lower than Euro-Americans. Which doesn't mean that Afro-American geniuses don't exist. They do, just in fewer numbers.
On the other hand, many Afro-Americans are not "pure" Blacks - but have also some Europeans among their ancestors -, and their skin is lighter - on average - than that of Africans. Let's just compare average faces, and you will notice obvious "whiteness" of Afro-Americans when compared to Sub-Saharan Africans:
http://leadingpersonality.wordpress.com/2013/09/30/average-faces-of-men-and-women-around-the-world/
Compare especially West Africans with Afro-Americans (because African ancestors of Afro-Americans were West Africans):
I doubt that climate made them whiter - 300 years of presence in the USA is not enough time for a climate-related change.
Climate will eventually make them naturally whiter, but this rather takes few thousand years - not just a few hundred years.
On the other hand, genetic studies have shown that Afro-Americans have on average about 9% of Non-African (European, Native American, Asian) genes in their DNA. Most of it was inherited through sex with European males (plantation owners, etc.).
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Here average faces of some other Sub-Saharan African populations:
http://translate.google.com/transla.../www.xpomo.com/ruskolan/rasa/phenotype_02.htm
For example:
Nilotid anthropological type (South Sudan, Uganda, North-West Kenya):
Igborid anthropological type (found mostly in Nigeria and Cameroon):
Hoid anthropological type (among indigenous Bushmen of South Africa):
East Aethiopid anthropological type (mostly Somalia, Eastern Ethiopia):
Now tell me that I was wrong that diversity between various groups of so called "Black people" is enormous.
However, Afro-Americans are in vast majority descendants of just few ethnic groups from some parts of Western Africa.
Eurasians are descendants of groups of African migrants, but it doesn't mean that those migrants looked like Nilotids. They could look like another type. So I wrote that early Europeans had "dark" skin, but not that they had black skin - this is unknown.
Most probably that group of Africans which gave birth to Whites and Mongoloids was relatively small and homogeneous. Only 5% of original gene pool of humanity migrated out of Africa to colonize other continents. If not counting recent slave trade, of course.
If you don't treat Africans as "one", but break them down into groups like these above, you will find differences in IQ. Some of these groups must inevitably have higher and some lower avg. IQs, due to random lottery effects. 100% equality is only possible in Utopia.