Kristen

Looking at this pro-slavery treatise, especially on and after page 45, you will see the following arguments (these are summaries, not direct quotes):

That the Church has traditionally, for 1800 years prior to the the current age, supported slavery.

That the plain sense of the Scriptures is pro-slavery.

That the problem is not the institution of slavery, but the abuse of it by some men.

That those who oppose slavery are bowing to the godlessness of their own modern culture.

That the African race is designed by God to be under the white race, as can be proved in the book of Genesis, and is happiest when it embraces that design.

Also look at this source. The main argument here is that slavery was normative in the Bible and therefore should be considered divinely sanctioned today.

http://books.google.com/books?id=4DYKAQAAMAAJ&printsec=frontcover&dq=A+Scriptural+View+of+the+Moral+Relations+of+African+Slavery&source=bl&ots=Nu8-24kFqn&sig=qRdk6o-faYd9SA29Yn9AwWNrC_A&hl=en&ei=9y86Ta6jMJDEgAeM_aWvCA&sa=X&oi=book_result&ct=result&resnum=1&ved=0CBYQ6AEwAA#v=onepage&q&f=false