Did the Americans do that with Native people? Historically, some native tribes were aligned with the US government, and some were not. It would be weird to malign your allies as irredeemably savage. For example, modern day Western racists might not differentiate between Chinese and Japanese, but the US government in WWII made sure to try teach people how to differentiate between the two(using racist tropes - negatives one for Japanese and positive ones for Chinese): http://historymatters.gmu.edu/d/6795/