Why do people think the term Mullato is the same as Mulato which means mule?

Mullato was generated from the Spanish using the word Casta and Pardos to define biracial or mixed race people. The word was first used 400 years ago to label children who had one black parent and one white parent. Mulus and Mulato was theoretically what people mistook Mullatto for since those terms meant the... show more Mullato was generated from the Spanish using the word Casta and Pardos to define biracial or mixed race people.

The word was first used 400 years ago to label children who had one black parent and one white parent. Mulus and Mulato was theoretically what people mistook Mullatto for since those terms meant the offspring of a horse and donkey.
Update: Since it causes so much confusion and debate should biracials just call themselves biracial?
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