Did you have anothe scenario for how the Ten Tribes will be gathered? Or do you believe, as do many, that they forfeited their standing and those blessings?
The Lord will re-gather the jewish nation together in Israel where he will reign. That doesn't include Missouri, and no they did not forfeit their standings or blessings, they were only paused.
Your declaration the Book of Mormon is fiction does not make it so. But since you have evidently come to that conclusion, I wish you peace and luck in your new year and beyond. I am more than willing to discuss matters with those who are honestly seeking information but it is a waste of time for both of us to bandy about with someone whose mind is already decided.