The conversation between Trevor's mother and the minibus driver showed how the enmity between the Zulu and Xhosa tribes was violent and full of cruel stereotypes.
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Trevor claims that the Zulu and Xhosa trios were very different from each other, particularly in terms of their stances against the colonial elite. He claims that the Xhosa were positioning themselves politically and diplomatically, while the Zulu were positioning themselves in a combative and violent way.
This question is related to the book "Born a Crime."
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