Advocacy: social justice in Deuteronomy

Last Tuesday morning, after we looked at the passage in Leviticus, we looked at the fifteenth chapter of Deuteronomy, which was Moses' last speech before he died. It covers a lot of similar stuff to the Levicticus passage.
Some other stuff I noticed in this passage though, is that Moses doesn't tell the Israelites not to make money by lending to other countries. I suppose that might've been so that other countries who wouldn't be generous in return wouldn't be able to abuse the Israelite economic system. Dunno what I think about it though.
Another thing I noticed is that their slavery system seems a lot different to how Africans were enslaved to work in North America, or how Pacific Islanders were enslaved to work in Australia. Slaves had to be freed in the Jubilee year, and they had to be paid for the time they'd spent working for their masters. (12-18)