Because the state is rather large, the land owners were profiting off off these slaves.
There are many ways God shows us His love, one of the biggest being that He sent down His only Son to die for our sins. A few others are giving us forgiveness no matter what we do as long as we repent and ask for it, and the blessings He gives us in our everyday lives. Hope this answers your question, God bless you
Let's start off with what a brief explanation of what social stratification is; Social stratification is a persons ranking in society. Whether it be financial wise (the most common), the age group, education, and even family power. An early form of this could be the Roman Empire's hierarchical structure; they had the lowest class which would be the slaves and then would work their way up to the highest class which would be the Emperor.
I hope this helped.
Control, complete government control