Approximently at least 5% of high school students smoked
I believe the answer is: Integrative theory
Integrative theory view that society could never be exist unless each individuals fulfill their own roles. These happen because humans are unique in terms of our talent/capabilities. So in order to crate a well functioning society, different humans had to integrate our different capability to operate it.
Because, slavery is the act of owning another, to slavery abolishers it was unconstiutional and ungodly. They sought and fought for equal rights and freedom for their bretherns'.