The reasons why there's no way J. Smith COULD have made up the BOM are many, but one reason is that some of the supporting evidence wasn't known by any human being in 1829--not even Joseph Smith. In order to fully comprehend the importance of the claims this article makes, a certain level of critical thinking skills will be required. For those who are willing to read and try to get a grasp of what this article shows, here it is:

http://www.studioetquoquefide.com/20...em-i-hope.html

A few sentences from it:

"Of particular interest is a correlation Sorenson made decades ago, but which now seems more powerfully confirmed than before. I am talking about Lake A***lan as the waters of Mormon (G on the maps above). I have mentioned before how since Sorenson made this identification, and supposed that the Lamanite city Jerusalem had sunk into these waters at the time of Christ, a submerged city was discovered decades later in about the right area. ...The site contains a pyramid and at least 10 monuments (altars and uncarved stelae). The stelae are of the same type as those found at highland sites that date to the Middle and Late Pre-Cl***ic periods (600 BC–AD 200). In their discussion of the remains, Medrano and Samayoa conclude that “because of the intact state of the [ruins at Samabaj] . . . , it is inferred that the level of the water rose suddenly, submerging the island [to which the site is confined] some 2,000 years ago.”... the correspondences between Mormon’s text and the geography of Mesoamerica go far beyond coincidence...“The consistency cannot be accounted for in terms of Joseph Smith, for his translation of the volume was dictated at such a pace and published with so little revision of content that he could not have accurately crafted the picture of spatial relations involved in the complex story.

Most readers today, even those who read the text slowly and study it carefully, often struggle to keep the geographic details straight or to visualize the spatial relationships of the various lands, cities, and waterways. Joseph Smith’s own remarks on Book of Mormon geography manifest that he was as confused as we are when we read the book. John E. Clark remarks, “it is becoming clear that Joseph Smith did not fully understand the geography, scope, historical scale, literary form, or cultural content of the book.” And why should he? He was a farm boy with a gift and mission from God, not a scholar of American (or Israeli) antiquities. Yet the book accurately describes matters such as geography, history, and culture, as Sorenson’s Mormon Codex makes evident."