These verses refer to the founder of that peace—Jesus Christ. Without him there would be no peace. In Abinadi’s words:
18 And behold, I say unto you, this is not all. For O how beautiful upon the mountains are the feet of him that bringeth good tidings, that is the founder of peace, yea, even the Lord, who has redeemed his people; yea, him who has granted salvation unto his people;
19 For were it not for the redemption which he hath made for his people, which was prepared from the foundation of the world, I say unto you, were it not for this, all mankind must have perished.