On the eve of America's bicentennial in 1976, a leading authority of the Church of Jesus Christ of Latter-day Saints rose to speak at the Mormons' biannual General Conference in Salt Lake City. "Can we maintain our basic freedoms, peace and prosperity for another 200 years?" he asked, rhetorically, before continuing, "The answer to this question is yes, if we shall individually repent and conform to the laws of the God of this land, who is Jesus Christ."
The sermon that followed was titled "America's Destiny." Its preacher was Marion G. Romney, a member of the Mormon elite and cousin of...