Because they aren't. Have you ever met a middle class Afro-Caribbean (II knew a lot of those)? They can be quite clever. Just like white people. Or Asians. Or whatever.
Haha your topic post was kind of misleading in my opinion. Because I'm an asian and I don't consider myself smart at all But it all kind of depends on which culture and country you're from, and which kind of school system you have. When it comes to measurements on which countries who are the smartest, it kind of depends on who the school takes in for the testing. In Norway, we take in everyone, even peoples with dyslectic and dyscalculia. And other countries they only test the very best peoples. Now compare that country to Norway, and you'll get your statistic..
Now, we need to seriously take a look at our education system and model it more towards how the Asians do it.
I know Japan has tougher schools because they have longer school days, weeks, and years.
That is something we need to seriously consider doing in our own country.
Any suggestions?