They wanted them out of the picture and have their land usually. Once you make up your mind; "it's either us or them." your not going to find anything good to say about the natives you want to disappear. Credit them with nothing and gain support to evict by spreading propaganda & lies.
Westerners denied the influence of natives primarily to maintain control, discredit cultures they perceived as inferior, and pursue economic exploitation. Propaganda was used to justify their dominance and foster support from colonizers. This disregard allowed Western rule to impose governance strategies without recognizing native rights or heritage.
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