Mormon introduces a very important theme here. The sign of the coming of the Lord brought belief in the Messiah, and this belief brings peace. For Mormon, one of the signs of the Messiah is peace. This is a sign that comes not from the overt phenomena of nature, but because of the power of this Messiah. It is based on the Messiah of the end of times and the prophecies of his impact upon the world. The following passage from Isaiah is also found in Nephi’s record in 2 Nephi 21:1-10:
Isaiah 11:1-10
1 And there shall come forth a rod out of the stem of Jesse, and a Branch shall grow out of his roots:
2 And the spirit of the LORD shall rest upon him, the spirit of wisdom and understanding, the spirit of counsel and might, the spirit of knowledge and of the fear of the LORD;
3 And shall make him of quick understanding in the fear of the LORD: and he shall not judge after the sight of his eyes, neither reprove after the hearing of his ears:
4 But with righteousness shall he judge the poor, and reprove with equity for the meek of the earth: and he shall smite the earth with the rod of his mouth, and with the breath of his lips shall he slay the wicked.
5 And righteousness shall be the girdle of his loins, and faithfulness the girdle of his reins.
6 The wolf also shall dwell with the lamb, and the leopard shall lie down with the kid; and the calf and the young lion and the fatling together; and a little child shall lead them.
7 And the cow and the bear shall feed; their young ones shall lie down together: and the lion shall eat straw like the ox.
8 And the sucking child shall play on the hole of the asp, and the weaned child shall put his hand on the cockatrice’ den.
9 They shall not hurt nor destroy in all my holy mountain: for the earth shall be full of the knowledge of the LORD, as the waters cover the sea.
10 ¶ And in that day there shall be a root of Jesse, which shall stand for an ensign of the people; to it shall the Gentiles seek: and his rest shall be glorious.
This Messiah in inextricably connected to peace, and for Mormon, the appearance of this Messiah must necessarily institute peace. Here it happens because he has come to the world, even if not to their world. This peace will come again after he actually appears in the New World.