Orson Pratt defines the American continent as containing North and South America.
Orson Pratt, “Meeting of Adam With His Posterity in the Valley of Adam‐Ondi‐Ahman,” in Journal of Discourses, 26 vols (Liverpool: Joseph F. Smith; London: Latter-day Saints' Book Depot, 1874), 16:54–55
Notwithstanding brass is a metallic substance capable of being dissolved and crumbling back, in a few years to the elements, yet there was a miracle wrought upon these plates of brass. The Prophet said that these plates of brass should not be dimmed by time, that God would preserve them to the latest generations. What for? In order that they might come forth and their contents be translated by the Urim and Thummim, that these contents might be declared to all nations, and kindreds, and tongues, and people, who were the descendants of Lehi upon the face of all this continent, from the frozen regions of the north to the very utmost extremities of South America. That all these nations should come to a knowledge of the things contained on those plates of brass.