Book of Mormon
Joseph Smith claimed that the record originated from gold plates that he was guided to find by an angel, and then used a spiritual gift from God to translate the book into English. The book says that the language it was first written in was made from "the learning of the Jews and the language of the Egyptians."
The story that is in the Book of Mormon is a shortened version written by a man named Mormon of the story of two groups of people called the Nephites and the Lamanites. Their ancestors left Jerusalem with their father Lehi about 600 years before the birth of Christ, sailed across a very big ocean, and came to live in the New World. It gives a story of their families, cities, wars, systems of government, spiritual experiences and religious beliefs among other things. The main purpose of the Book of Mormon is to teach about Jesus Christ.
It also contains the Book of Ether (a very old book discovered by the Nephites) which told the story of another people (called the Jaredites) who had lived in some of the same areas shortly after the time of the Tower of Babel, but died out because of wars.
Usually, Book of Mormon stories show the Nephites as the more righteous, industrious and peaceful people and the Lamanites as wicked, lazy and warlike. Wars happen all the time between the two groups. But, near the end of the book, the Nephites become more wicked than the Lamanites, and all the Nephites die in their last war, except for one named Moroni who was directed by God to bury the Book of Mormon in a hill so that Joseph Smith Jr. could find it.