Christ and with his family crossed the mighty deep and landed in America. And Lehi and his family became the ancestors of all of the Indian and Mestizo tribes in North and South and Central America and in the islands of the sea". Ted E. Brewerton, a general authority of the LDS Church, stated in 1995: "Many migratory groups came to the Americas, but none was as important as the three mentioned in the Book of Mormon. The blood of these people flows in the veins of the Blackfoot and the Blood Indians of Alberta, Canada; in the Navajo and the Apache of the American Southwest; the Inca of western South America; the Aztec of Mexico; the Maya of Guatemala; and in other native American groups in the Western Hemisphere and the Pacific islands". An introductory paragraph added to the Book of Mormon in the LDS Church's 1981 edition stated in part: "After thousands of years, all were destroyed except the Lamanites, and they are the principal ancestors of the American Indians." In a 2006 edition, the statement was altered to indicate that "the Lamanites ... are among the ancestors of the American Indians." This change, church leaders said, was in harmony with the claims of the Book of Mormon itself, and what some Latter-day Saints had long perceived. For instance, in 1929 Anthony W. Ivins, of the LDS Church's First Presidency, cautioned church members: "We must be careful in the conclusions that we reach. The Book of Mormon teaches the history of three distinct peoples ... who came from the old world to this continent. It does not tell us that there was no one here before them. It does not tell us that people did not come after. And so if discoveries are made which suggest differences in race origins, it can very easily be accounted for, and reasonably, for we do believe that other people came to this continent. A thousand years had elapsed from the time the Book of Mormon closed until the discovery of America, and we know that other people came to America during that period." The origin of the Jaredites According to the Book of Mormon, the Jaredites were a group of people that left the Old World after the fall of the Tower of Babel. Some Mormon researchers believe that Jaredite survivors of the war that destroyed their civilization, as described in