After conquering, the Rounds instilled into the Triangles by repetition, "You are a barbaric inferior race." As the outcome, the Triangles also started to believe that they themselves were an inferior race and regard the Rounds as their masters and beings like gods.
illusion of racism 
"The Triangles are an inferior race and the Rounds are more advanced, a superior race"; gradually this fantasy became common sense shared by most of people on this planet.

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