European Americans DIDN'T enslave west Africans because they were stronger than others (picking cottons doesn't require so much strength), they did that because west Africans have self hatred and slave mentality. Look at south Africa, (some of) the Bantus kill Nigerians out of xenophobic insecurities, in the east, Hutus and Tutsies have been killing each other out of jealousy.
Why in the hell the strong west Africans should let themselves become slaves of weak skinny short Arabs?! Even today, many of black Africans are treated like slaves in northern AFRICA! Man, that is the worst thing anyone can do to a person.
Have some self respect people; if you sell your brother into slavery, you will be treated like slaves too, and this is why all people around the world see the west Africans as slaves. I'm sure Libya will conquer the whole west Africa only in a week, why? Because those Arabs know the west Africans will accept their rule, but they won't do anything to, for example, Eritreans, because they know Eritreans will resist against them!
This is my opinion.