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In page History of Bolivian nationality:

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While all enjoyed a relatively institutionalized relationship with regards to the law and the governing bureaucracy, the main separation lay in the fact that the first two social castes held a vested interest in the tributary system, while the landless peasant did not. This led to a rapid decline in tributary populations, as these individuals would evade tax collectors and the official tax rolls. Therefore, to be perceived as Indian, or as truly indigenous, was not simply a legal and administrative tool, but rather a facet of everyday practices.[6] In fact, indigenous tribes began to advocate for a “hybrid tributary-citizenship status,” which was firmly entrenched with land holdings; in other words, to hold land meant obtaining some variant of official citizenship.[7]