Which language families make up the Mesoamerican linguistic area?

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The Mesoamerican linguistic area is defined by a collection of language families and language isolates that share structural traits due to long-term contact. These groups include:12

While these groups are distinct, they exhibit shared areal traits—such as specific patterns in nominal possession, the use of relational nouns, vigesimal numeral systems, non-verb-final word order, and various loan translation compounds—that distinguish them from neighboring languages outside the region.1