The prosperity of both the Nephites and the Lamanites (vv. 9–12) is evidence of the material blessing that comes from living the gospel. This is a lesson that is taught throughout the Book of Mormon (see 2 Nephi 1:20; Jarom 1:9; Mosiah 1:7; Alma 1:29–31).
The land south was called Lehi and the land north was called Mulek because of the places of their landings (Helaman 6:10). All of it was a land chosen of the Lord (see Alma 46:17). The word Mulek in Hebrew means “little king,” and Mulek was the young son of Zedekiah, king of Judah at the time Babylon destroyed Jerusalem. All of his sons were killed but Mulek. The exact place of either the Lehi or Mulek landing is not known and is somewhat controversial.
The brevity of the record of the sixty-fifth year is because of the peace that existed (Helaman 6:14). The Book of Mormon contains a record of a fallen people and the fullness of the gospel of Jesus Christ (D&C 20:9). When either peace or wickedness is continuous for a lengthy time, it is usually treated sparsely in the abridgment (see Helaman 6:33 for the brevity of continuous wickedness).