Fourth Nephi - 1
Discussion related to this chapter in the Book of Mormon
The Nephites and the Lamanites are all converted to the Church of Christ. They have all things in common, work miracles, and prosper in the land. After two centuries divisions, evils, false churches, and persecutions arise. After three hundred years both the Nephites and the Lamanites are wicked. Ammaron hides up the sacred records. Between A.D. 36 and 321
Source: LDS Scriptures