From Ronald W. Walker’s discourse, “Seeking the Remnant.” (View PDF here)
“Orson and Parley P. Pratt, early pamphleteers and apostles, continued the theme. The former held that the “western world, including both North and South America,” would ultimately pass to the righteous…”remnant,” while his brother argued for a literal reading of the Book of Mormon text. The prophecies contained therein, he held, were “plain, simple, definite, literal, positive and very express” and Jesus’ prophetic words of American upheaval must be fulfilled to the letter. “This destruction” I included “an utter overthrow, and desolation of all our Cities, Forts, and Strong holds, an entire annihilation of our race, except such as embrace the Covenant and are numbered with Israel.”
“With these and similar expressions serving as their guide and the Book of Mormon as their handbook, early Church members had no confusion about their imperative. They understood the need of taking the Restoration message to the Native American people, who in turn would play their pivotal role by purifying the land prior to helping to build the New Jerusalem. What was at issue was a major biblical prophetic watershed: turning from the “times of the gentiles” to the new and final era of the chosen people of Jacob.” (Luke 21:24; D&C 45:25-30).