Jeffrey R. Holland says that the American continent was empty until the arrival of Book of Mormon peoples.
Jeffrey R. Holland, "A Promised Land," Ensign, June 1976, 24
Holy scripture records that “after the waters had receded from off the face of this land it became a choice land above all other lands, a chosen land of the Lord; wherefore the Lord would have that all men should serve him who dwell upon the face thereof.” (Ether 13:2.) Such a special place needed now to be kept apart from other regions, free from the indiscriminate traveler as well as the soldier of fortune. To guarantee such sanctity the very surface of the earth was rent. In response to God’s decree, the great continents separated and the ocean rushed in to surround them. The promised place was set apart. Without habitation it waited for the fulfillment of God’s special purposes.