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The Iberian caste system was plenty complicated just with three races- European, Indian, and African. However, what if there was a fourth race- Arab/Berber, or Moorish? It seems like Black Ladino might be equivalent.
Carlton Bach's The Vivaldi Journeys had a different colonization of the New World (no unified Spain doing it), with knightly orders being a big deal. Some of them use Moorish auxiliaries in their ranks.
Could an alternate Reconquista ended up not having the Moriscos/Marranos forcibly converted to Catholicism, but instead exiled to the New World in large numbers? Or maybe they choose to willingly go there.