System dominated (domination) the exclusion (exclusive) by creating a discourse, believe the ethnic onaekwa looks bad and deserve the ethnic discrimination from "above".
Dominated system (domination) is sidelined (exclusive) by creating a discourse to believe. The weaker ethnic groups are inferior and deserving of discrimination by the ethnic "superiority".
The system possessed (domination) discourage (exclusive) by the discourse of make believe Ethnic groups and weak have recessive deserve discrimination from ethnic groups. "Over" .