Students will engage in a debate to build upon the caste system in ancient and modern India. They will debate if there is a class system in the United States in a similar fashion to the ancient Indian caste system. You can get as involved as you want...this whole lesson can be delivered in a day if you just want a short discussion, or you can include a few days of research and formal debate that will last 3-5 days.
Lessons in history are only lessons if we learn from them. Debating the ancient Indian system as it compares to the United States certainly does not imply anything negative about our country; it is merely an intellectual exercise for students to debate and explore how our country operates.