noun, masculine/kɔ.lɔ.nja.lism/plural: colonialismes
colonialism (the policy of a country seeking to extend or retain its authority over other people or territories, generally with the aim of economic dominance)
“Le colonialisme et l'impérialisme ne sont pas quittes avec nous quand ils ont retiré de nos territoires leurs drapeaux et leurs forces de police.” — Colonialism and imperialism have not settled their debt to us once they have withdrawn their flag and their police force from our territories.
From colonial + -isme.