Sadly the battle for freedom for all people is not yet over. If you are not convinced by that you could start by visiting http://www.antislavery.org/.
According to the tearfund webside, at http://www.tearfund.ie/news/slavery_st._patrick/, "There are 27 million people in slavery today. This means that there are more people in slavery today than at any other time in human history. Slavery has existed for thousands of years, but changes in the world’s economy and societies over the past 50 years have enabled a resurgence of slavery."
We really don't know how lucky we are!
Thank you to Geoffrey for arranging such an interesting evening.