Final answer:
The main problem in 'The Wave' is the transformation of a history class experiment into a powerful, controlling movement embodying autocratic tendencies, illustrating how easily society can succumb to authoritarianism.
Step-by-step explanation:
The main problem in the book "The Wave" by Todd Strasser revolves around an experiment in a high school history class that spirals out of control. The teacher, intending to demonstrate the power of group pressure and the ease with which society can slip into autocracy, creates a movement called The Wave. Despite its educational intent, The Wave becomes overly powerful, with students adopting extreme behaviors, enforcing strict discipline, and ostracizing those who do not conform. The compelling issue here is the movement's rapid shift from a lesson to a quasi-fascist organization, demonstrating the themes of power, conformity, and the potential for history to repeat itself.