As with all subjects, you have to look at what your school, county, and the state will allow. I'm all for telling the students the truth. It not only helps prepare them for the real world but it also allows them to see you in a positive light. If you tell them the truth even if it isn't pretty, they will see the importance telling the truth in all areas. With all the violent movies and video games the students watch, I don't think what really happened in America's history will be too much for them.