In verses 8 and 9, Nephi is writing about restoring the Jews to the lands of their inheritance, in other words what is now modern day Israel. Nephi also refers to the kings and queens of the Gentiles being nursing fathers and nursing mothers to them. This would be referring the the European nations including England which have treated Israel very well.
2 Nephi 10:8:13
8 And it shall come to pass that they shall be gathered in from their long dispersion, from the isles of the sea, and from the four parts of the earth; and the nations of the Gentiles shall be great in the eyes of me, saith God, in carrying them forth to the lands of their inheritance.
9 Yea, the kings of the Gentiles shall be nursing fathers unto them, and their queens shall become nursing mothers; wherefore, the promises of the Lord are great unto the Gentiles, for he hath spoken it, and who can dispute?
10 But behold, this land, said God, shall be a land of thine inheritance, and the Gentiles shall be blessed upon the land.
11 And this land shall be a land of liberty unto the Gentiles, and there shall be no kings upon the land, who shall raise up unto the Gentiles.
12 And I will fortify this land against all other nations.
13 And he that fighteth against Zion shall perish, saith God.
When Nephi gets to verses 10-13, he is talking about the land where the Nephites will live.
- It is the land where the Nephites will live.
- It is the land where the Gentiles shall be blessed upon the land.
- It is the Land of Liberty.
- It is fortified against all other nations.
- And lastly, reading into the intent of the message – it is the land that will be transformed into Zion.
What Nephi is describing most certainly is not “The Americas”. It is one nation only.
I did a Google Search on the Land of Liberty. Below is a screenshot of the first two results: