Members of the Church of Jesus Christ of Latter Day Saints are known as Mormons because the Book of Mormon was revealed the the founder of the church, Joseph Smith, at Palmyra NY back around 1820. Mormon was the name of the angel, son of Moroni, who appeared to Smith and gave him the Urim and Thummin, which, I think, were like spectacles that allowed Smith to translate and transcribe the Book of Mormon from the plates of gold on which it was originally written.
The Book of Mormon is the history of one or more of the lost tribes of Israel in the Western Hemisphere. American Indians are descendants of the Tribe of Laman, and are known in the LDS church as Lamanites. Mormons are given to saying, "I know this to be true."
I mention this because the poll at right confuses me. Is it asking about LDS members? Or is it asking if a member of the Morman Law Firm in Sturgis is a true American? If so, good question.