Should the Adventures of Huckleberry Finn be included in the curriculum of high school? Why? With textual evidence?

This is really asking for your opinion rather than mine. I think you need to consider the grade as well as the maturity of the students studying the book. To be sure, Twain's book is a classic. It is sympathetic to slaves and their plight. It is also damning to the culture of the South that supported it. In the end, it really depends on the students, parents, and teachers involved.