How could slavory in America been avoided?

Slavery has existed for millennia, and still exists today in remote areas of Africa, where radical Islamists enslave weaker Islamists or Christians. Slavery can only end or be prevented when the majority of the population agrees to forbid the "peculiar institution". In terms of Judeo-Christian values, slavery, since the inception of The Bible in mass printings, should have never been permitted. The Apostle Paul specifies in the book of Philemon that Philemon should have forgiven his slave, Onesimus, for running away and subsequently became a Christian. Paul urged Philemon to look upon Onesimus not as a slave but as a brother in Christ. Had the Christian world taken Paul's Words to heart, there may very well have been a termination of slavery in Christendom.

As far as the Islamic world is concerned, I mean no disrespect when I say that it is scientifically at par or advanced of western society, but socially many Islamic areas are backward and still living in the Middle ages, exploiting women, minorities, children and anyone who might questions their ironclad, repressive values.