The Helaman Migration and the Mixe-Zoqueans of Central Mexico
Disclaimer: The following does not represent much original thinking of my own nor does it "prove" Joseph Smith Jr. was a Prophet of God. Checkout Brant Gardner's work; it's my main source for this and other posts.
In Helaman 3, we read the description of a group of people who, in 50 BC, migrated to a land that:
1)is an "exceedingly great distance" northward of Nephite lands
2)a land of "large bodies of water and many rivers"
3)a place where people are expert in the use of cement.
4)a place that underwent deforestation.
5)a place which had people who hailed from south of the isthmus, Nephites and Ammonites.
6)and whose inhabitants "began to cover the face of the whole earth".
From about 200 AD to 600 AD the only area in the Americas that possibly matches these six criteria is the city of Teotihuacan. Teotihuacan is:
1)northward from the central depression of Chiapas.
2)is in the Teotihucan Valley, a side pocket of the Valley of Mexico. The Valley of Mexico was home to Lakes Xaltocan, Texcoco, Xochimilco and Chalco.
3)Teotihuacanos made extensive use of cement.
4)It has been proposed that the destruction of the surrounding forests necessary for the burning of the lime which went into building Teotihuacan contributed to erosion and desiccation of the region.
5)There was a strong Southern(Mayan) presence at Teotihuacan.
6)Teotihuacan influence extened into the Gulf Coast of Mexico, Oaxaca and as far south as Guatemala.
Of all these convergences, a seventh one might be added:
"... there were an exceedingly great many who departed out of the land of Zarahemla, and went forth unto the land northward to inherit the land. And they did travel to an exceedingly great distance, ...".
Mormon tells us that these people, who migrated far north, came specifically from the land of Zarahemla, which, per Sorenson's model, would be the central depression of Chiapas. These Nephites would then be Zoquean speakers and they eventually settled in Teotihuacan(See Here). And it was from there that Mormon's contemporary "Gadianton Robbers" flourished and eventually came down to southern Mexico for profit then conquest.
What's interesting is that according to Terence Kaufman, Mixe-Zoquean speakers settled in Central Mexico, sometime between 100 BC and 400 AD, eventually becoming a heavy influence on the Nahuatl(Aztec) language: