Nephi counters his brother's persecution by reminding them about Moses and the children of Israel. When they got to the promised land, the drove out the people who were there, then discusses an important point:
So when the children of Israel drove them out, nationality had nothing to do with it, culture had nothing to do with it, race had nothing to do with it. The Lord esteemeth all flesh in one - he that is righteous is favored of God. Note verse 34 - the children of Israel would not have been more choice. The only requirement to receive God's favor is righteousness - not lineage, not heritage, not bloodline. Each individual and nation rises or falls based on the condition of righteousness.
This pattern of God leading a group to a promised land, preparing the way before them has a few examples: Moses and the children of Israel, Lehi and Nephi's journey, the discovery of America, the westward migration of the Saints in the 1840's. Each one fulfills the Lord's purposes is some way: