What are some limitations that historians studying Mesoamerican cultures face when trying to get information?

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Some limitations that historians studying Mesoamerican cultures face when trying to get information is that these Mesoamerican civilizations such as the Aztecs, the Toltecs, the Olmecs, the Mayas, or the Zapotecs registered their stories and events in the form of "codices," which are a series of drawings or pictographs that are not easy to understand or to translate.

In the case of the Mayas, just a little bit is known about them because anthropologists and archeologists haven't been able to understand and translate their codices and teh Mayan stelae.

These Mesoamerican civilizations did not have an alphabet as we know it today. They sculped and craved in stones a series of codices, figures, and representations that must be translated and interpreted.

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the doctrine of nullification recommended that states living inside the union have the one-sided, inalienable ideal to void any law made by the national government that could be esteemed illegal.

the united states was shaped based on a general agreement among its individual states. hence, it is inferred that under the hypothesis of invalidation, since the states are the establishment of the union, they have the ability to referee and disprove unlawful laws.