***In recent years, many LDS scholars have come to share Butler’s belief in what is known as the “limited geography” theory. By this view, the Nephites and Lamanites restricted their activities to portions of Central America, which would explain their absence from the general American Indian genetics. ****
So how did this “book” end up buried in a hill in New York if it only pertains to Central America.
Oh, Details, details, details. (Shh. Ya don't want to cut into the tourist industry in the Hill Cumorah region of NY, do you?)
The BoM says that Mormon gave the record to his son Moroni who took it all the way up there to put it where it needed to be, writing the last few chapters as he did so.