The "Aztec children," who were in fact Salvadoran adults with microcephaly, were exhibited in Boston at least twice: 1850 and 1862. I'm not sure who the African woman who toured with them was. Eventually the "Aztecs" joined PT Barnum's museum.

The part about visiting European royalty is, apparently, true:
https://en.wikipedia.org/wiki/Maximo_and_Bartola

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