that native Americans are not descended from the Hebrews at all, and there are references to wheeled carts, horses, steel, and the 7 day week, none of which were around in the West during the pre-Columbian era. I am not trying to be mean, I would like to believe in this story of the Lamanites and Nephites so please tell me how are these contradictions solved?

How do you do DNA testing without DNA?

People say that DNA testing has proven the Book of Mormon to be false, because it shows that the Native American Indians are not descended from the Jews. But, wouldn't you need the DNA of the people who you are comparing DNA with? For example, to know if today's Native American Indians are descended from the Lamanites, you would need the DNA of the Lamanites from the end of the Book of Mormon. And even then, nothing will be conclusive, since many centuries have passed and DNA gets "diluted" or "evolved" or whatever.
Smart as he is, I do not rely on Jeff Lindsay on this, I refer to other LDS scientists who are more expert in the field of DNA.
Actually, I don't beleive there was any actual testing done. It was based on the results of other testing done for other reasons. If it had been testing of actual Lamanite remains, it might have made more of an impression.