Textual: Most typically in the Book of Mormon, "wherefore" is used as a causative conjunction. That is, it joins two concepts where the second is caused by the first. In this case, the antecedent of the "wherefore" cannot be the immediately preceding citations of from Isaiah as the reversal of the order manifest in those verses (from earthly contention to heavenly peace) is not the cause of revelation of all things. This comes as a function of the reign of the Messiah, and it is that reign that causes both this revelation of all things as well as the alteration of the normal order of the things of the world.
The antecedent is then not a specific verse, but this entire section that is interweaving texts from Isaiah. It is the coming of the Messiah in glory at the end of the world that will create this revelation of all things.