Well, the 'American Hangman' true story could also be about the history of capital punishment in America. Hangings were a common form of execution in the past. It might tell tales of prisoners on death row, their last days, and the public's reaction to such executions. There could be stories of protests against hangings, or of those who worked to reform the system to prevent wrongful hangings. It might also include the stories of the executioners themselves, their moral dilemmas and how they coped with their jobs.
The 'American Hangman' true story might revolve around individuals who were involved in legal battles where the ultimate punishment was death by hanging. It could be stories of people fighting against a flawed legal system that was quick to condemn them, perhaps due to racial or social biases. For example, there could be cases where evidence was misinterpreted or fabricated, leading to a person being on the verge of being hanged unjustly.