So, I'm just thinking out loud here, so don't go getting crazy on me or anything, but here's what I'm pondering tonight:
Sunday School this week covers the rest of Nephi's Vision, including the discovery of the Americas. Go read this.
Now, in light of the information in this book, I have to wonder, was Christopher Columbus perhaps included in the "other Gentiles" rather than being the man the spirit "wrought upon?" I haven't looked too treribly closely at what our book says about Columbus, but the author seems pretty adamantly clear that the European explorers knew to one degree or another that someone had already been where they were trying to go.
Something to ponder.