The essential elements [in Helaman 3:3-7] that allow us to make a tentative identification of this area are:
Desolate of trees
Buildings of cement
From perhaps 100 BC to 600 AD there is one area in Mesoamerica that fits all of these descriptions, and that it Teotihuacan. It is north of the Nephite (and Jaredite) lands. It is near the lake that used to occupy the current site of Mexico City. The lack of trees and the environmental imbalance created by denuding the land of trees is hypothesized as a major factor in creating the downfall of Teotihuacan. One of the reasons for the lack of trees was the creation of the cement with which their buildings were built (George C. Vaillant. Aztecs of Mexico. Penguin Books, 1966, pp. 78-9O). There is only one area in Mesoamerica that fits this description well, and that is Teotihuacan.
Historical/ Historiographical: In spite of the accuracy of this description of Teotihuacan, there is nevertheless a major problem with the fit. That problem is one of timing. The particular condition of the area being devoid of trees does not describe the Teotihuacan of 49 BC, but rather the Teotihuacan of 350AD and later.
What we have in this case is Mormon describing the Teotihuacan that he knows in his own time, and assuming that it was the same at the time of this part of his history. When Mormon describes this people who leave, he is describing a group of people who do not return, and of whom Mormon would have no record. Mormon therefore has no historical document before him that would accurately describe the land northward to which these people emigrated. Nevertheless Mormon describes that land in great detail.
If Mormon has no historical record to tell him where the people went, and has no historical record to tell him what that land was like, how does he describe it so thoroughly? It is Mormon who makes the association between this group of people and the city of Teotihuacan for his own purposes. He describes that city and land from the perspective of his own time, because that it what he knows. . . .
[In Hel. 3:5,] Mormon gives us this quick statement that the people went into areas that "had not been rendered desolate and without timber." On the surface, this would appear to be a very unusual statement for the Mesoamerican area in which we are placing the Book of Mormon. This is a land of heavy forestation. Where would they have gone that even might have been "desolate and without timber?" The answer lies in the population explosion and the effects of population on the land. This land has had over a thousand years to recover, and it is only recently that scientists are beginning to discover that this land of jungle had been stripped of trees as a result of the high density of certain Mesoamerican populations and their lifestyle. One of the earlier cities to suffer extinction was the great metropolis of El Mirador:
"But in the second and third centuries AD disruptions and catastrophe hit the Maya world. About AD 150, El Mirador seems to have collapsed quite suddenly. Until very recently, it was a mystery why this had occurred. Archaeologists had found signs of violence in the city centre. Many monuments and most of the stelae recovered here were found smashed. Were they invaded by their enemies? Yet the signs of abandonment were almost total and it seemed extraordinary that such a great power should fold so completely. Today the findings of climatologists and soil scientists are suggesting environmental reasons for El Mirador's demise.- For the tens of thousands of people congregated in the area would very quickly have destroyed the forest cover for miles around."They cut down trees to cook, to fire pottery and above all to burn the lime to produce ton after ton of lime plaster for endless construction projects and repairs to buildings and reservoirs. As they did this, the climate began to change. After about AD 100 it became drier across this part of the lowlands, a cyclical phenomenon which was to last for about four hundred years. This increased aridity may well have been enhanced locally by the scale of deforestation. And when it did rain, the water ran soil and sediment from the denuded landscape into the once-fertile swamps. In due course they dried up." (David Drew. The Lost Chronicles of the Maya Kings. University of California Press, 1999, p. 145-6).
This same fate awaited the great city of Tikal. It is hard to imagine today when most of the world’s image of Tikal comes from the first Star Wars movie where Tikal’s temples rising from a dense jungle was the picture used for the "rebel base" at the end of that movie. In the Late Classic, someone standing on one of those same temples would have seen virtually no trees for as far as vision could perceive. Pollen samples and lake-bed cores indicate a very high degree of deforestation at that time -- not coincidentally not long before the collapse of the once powerful city. (David Drew, 1999, p. 345).
Not surprisingly, it is this same deforestation that is suggested as one of the major causes of the downfall of Teotihuacan, which was beginning during Mormon’s lifetime. What we see from Mormon is an accurate depiction of the world around him, but imputed to an earlier time.
Fascinating! Thanks, Brother Gardner.
Remember, when critics say that not a shred of concrete archaeological evidence has been found in support of the Book of Mormon, they are expressing a testimony based on their feelings and blind faith, not facts. Cement manufacture and deforestation in a region that agrees with Book of Mormon geology is an interesting issue, one that was unknown to Joseph Smith. This does not prove the Book of Mormon to be true, but does disprove the claim that their is no archaeological evidence that supports anything found in the Book of Mormon.