majick275:
Now surely you didn’t expect that sweeping generality to pass unchallenged.
I prophesied as much

.
Which LDS scholars and how long?
I wanted to give this information, but it would cut into my word count. This info is found more extensively on the Sites That Can’t be Mentioned. To answer your questions briefly: ~50 years ago the LGT (Limited Geographic Theory) was all the rave on BYU campus. The periods marks the LDS church’s first generation of trained archaeologists including H. Wells Jakeman and the founding of the New World Archaeologist Foundation. As Dallin H. Oaks pointed out in 1993:
For me, this obvious insight goes back over forty years to the first class I took in the Book of Mormon at BYU. The class was titled, somewhat boldly, the “Archaeology of the Book of Mormon.” In retrospect, I think it should have been labelled something like “An Anthropologist Looks at a Few Subjects of Interest to Readers of the Book of Mormon.” Here I was introduced to the idea that the Book of Mormon is not a history of all of the people who have lived on the continents of North and South America in all ages of the earth. Up to that time, I had assumed that it was. If that were the claim of the Book of Mormon, any piece of historical, archaeological, or linguistic evidence to the contrary would weigh in against the Book of Mormon, and those who rely exclusively on scholarship would have a promising position to argue.
In contrast, if the Book of Mormon only purports to be an account of a few peoples who inhabited a portion of the Americas during a few millennia in the past, the burden of argument changes drastically. It is no longer a question of all versus none; it is a question of some versus none. In other words, in the circumstance I describe, the opponents of historicity must prove that the Book of Mormon has no historical validity for any peoples who lived in the Americas in a particular time frame, a notoriously difficult exercise. You do not prevail on that proposition by proving that a particular eskimo culture represents migrations from Asia. The opponents of the historicity of the Book of Mormon must prove that the people whose religious life it records did not live anywhere in the Americas.
LDS prophets seem to have stated otherwise for 175 years.
I agree that a hemispheric geography has been a a near consensus among general authorities and prophets. The history is too long to point out notable exceptions that have appeared in LDS publications since and during Joseph Smith’s time. Again this has been done elsewhere.
I don’t mean to minimize the disapointment that some LDS feel their leaders, including Joseph Smith, were fallible in their interpretations of the Book of Mormon with respect to geography. Clearly some former LDS have left the LDS church over this issue. I am not going to follow suit anytime soon, because an analysis of distances presented in the Book of Mormon itself show a small scale geography.
From what I understand, the debate is not over the science. A famous quote by an ex-LDS Bishop,
Dr. Southerton (please check the context, much of his stance disagrees with mine), admits that science can not disprove the LGT.
In 600 BC there were probably several million American Indians living in the Americas. If a small group of Israelites, say less than thirty, entered such a massive native population, it would be very hard to detect their genes today.
The main arguments are over what the best read of the Book of Mormon is, LGT or H(emispheric)GT and how to deal with mistaken interpretations of the past (critics have LDS on the defensive here.) Beyond a few remarks, I am not interested in replaying these arguments as they are already hashed out in readily available literature.
From my perspective, the “science” of the day became a common assumption, even cropping up in the language revelations were recorded in. This doesn’t bother me because I see “
propositional revelation” in the Bible make the same types of erroneous assumptions. Catholics do a good job allowing these types of discrepancies, limiting infallibility to matters of “
faith and morals” and accepting the progress of science. The LDS church is young, but will weather the current growing pains and hopefully practice will morph to what the belief in theory has been about the errancy of leaders all along.
[cont]