In General some Arabs Muslims were involved in the slave trades for ages, enslaving both Christians and non-Christians, including Muslims.
You should read a book written by a Muslim woman Irshad Manji called "the problem with Islam", here is a link to an article about her. In her book she write about her experience with their house slaves in Africa. How her father would beat them and would beat her or her mother if they attend to the slaves and try to help them. I was chocked when I read it because this was not a tale from 200 years ago this was 30 years ago.
Did you know for example that slavery was outlawed in Saudi Arabia only in the sixties? But is actually practiced until today.
You should check this report. Really scary, majority of human trafficking to Saudi is coming from Asia but some are from Africa. http://gvnet.com/humantrafficking/SaudiArabia.htm
What happened in Sudan?http://theseoultimes.com/ST/?url=/ST/db/read.php?idx=1462
It is very sad that in our time people are still enslaved, women have no rights to live free, children have no right to education and we sit here and blame white male.
About American companies look at Mereck who sponsored and paid for medication for children in Africa, that would be other wise blind.