The Book of Mormon is a volume of holy scripture comparable to the Bible and is a record of God's dealings with His chosen people in the New World. The main purpose of the Book of Mormon is "to the convincing of Jew and Gentile that JESUS is the CHRIST, the ETERNAL GOD, manifesting himself unto all nations." (Book of Mormon Title Page) It was written by ancient American prophets for our day (Mormon 8:35) and is an American testament of the Lord Jesus Christ.
"The gift I am thinking of is more important than any of the inventions
that have come out of the industrial and technological revolutions. This
is a gift of greater value to mankind than even the many wonderful
advances we have seen in modern medicine. It is of greater worth to
mankind than the development of flight or space travel. I speak of the
gift of the Book of Mormon, given to mankind 156 years ago."