If the Book of Mormon took place outside of Mesoamerica (like in New York where the Hill Cumorah supposedly is), why are written languages of ancient America only found in Mesoamerica?

• 如果《摩门经》发生在中美洲之外（像在克谟拉山岗被宣称所在的纽约州），那为什麽有书写文字的语言只有在古代中美洲被找到?