I used the lesson about the Indian Removal Act that led to the forced removal of Cherokee Indians and the Trail of Tears. It was the most engaged I had seen my 9th graders in a while. They actively wanted to learn more about the proposed law, how it would affect different groups, and the relative amounts of power different groups held. They argued and negotiated their way through the simulation, absorbing the information and practicing their negotiation and writing skills. In short, it was awesome.