Who are the cronistas of the new world, and how did they influence it?

A cronista is a chronicler. A person who gathers historical facts. Since it's a Spanish word, it's referring to Spanish historians. It would stand to reason that they had a bias towards the Spanish version of events and not the Indian version.Since they wrote from a European perspective, they influenced their readers towards thinking of the natives as uncivilized, savage, heathen and inferior.

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Bolsa can be referring  to any type of bag,