The church officially does not take a position on who the Nephites were
They used to in my youth. Now that all of this evidence that you claim exists, why do you suppose the church no longer takes a position?
That's because in your youth it was meso America 2000 miles away from the hill Cumorah and found no evidence for it. The North American model has evidence and matches the Book of Mormon much better.
I was taught in seminary it took place in meso america
David McKane, you are quite young aren't you? I can assure you that it was not Mesoamerica in my youth. It was hemispheric. Have you even read my posts? I was taught that the Cumorah in New York was the location of the final battle, it was stated so by apostles in General Conference numerous times. The church of your youth was not even the same church as the one from mine.
You claim to have all of this evidence, but the church stopped saying where the final battle happened. They no longer claim a hemispheric model and have no official position on where any of it happened. All of your so-called research and claims are not backed by the church. What will you do if the church announces at some point in the future that the Book of Mormon is no longer canonized scripture and is not an ancient record?