Well, devil's advocate here, Imperialism was justified because of the advances in health, science, technology that slavery allowed. (?) Like, make an arguement that even though it was inuman etc that the free time allowed the priveleged to focus on scientific advances that benefited everyone.
The trickle down of scientific and other knowledge from Dominator Society to Dominated Society.
Something, kinda off topic, that's irked me in a few College History Classes is when professors say that 'diversity is strength'...like when they're talking about how the English and soon-to-be Americans just didn't recognize the Indigenous Peoples Diversity. Etc.
The English (apparently) didn't *understand* that 'Diversity is Strength".
If if that simple and diversity = strength the 'indians' wouldn't have been decimated and turned against each other quite so easily. Same goes for the Democrats in most elections!
Diversity is good for some things...like exploring posibilities and discovering new ideas...but having a streamlined, loyal and shark-like organization is good stuff too IE> attacking and destroying your enemies and getting stuff done.(something many Food Not Bombs, Left Wing Protest groups would be wise to understand.
(putting my soap box away now

Good luck, you have your work cut out for you, but it sounds really interesting!