In which situation should a high school history teacher consult the principal before proceeding with an instructional plan?

Consulting the principal before conducting an activity to raise awareness of discrimination is appropriate because it may involve sensitive topics and potential controversies. When discussing discrimination, issues such as race, gender, and socioeconomic status can evoke strong emotions and differing viewpoints among students, parents, and the community. Having the support and guidance of the principal ensures that the activity aligns with school policies and that there is a clear framework for handling any potential backlash or discussions that may arise. This collaborative approach also helps create a safe and respectful environment for all students during sensitive discussions.

In contrast, showing a movie excerpt, inviting a nonviolent protester, or supplementing the textbook with eyewitness accounts generally involve educational content that is typically within a teacher's discretion to implement. While these activities can also be meaningful and valuable, they may not carry the same immediate need for administrative oversight as activities focused on discrimination, which might require more careful handling and preparation to ensure a constructive and supportive educational experience.