'Nations of the Earth' in the Bible

Seeing that Abraham shall surely become a great and mighty nation, and all the nations of the earth shall be blessed in him?

And in thy seed shall all the nations of the earth be blessed; because thou hast obeyed my voice.

And I will make thy seed to multiply as the stars of heaven, and will give unto thy seed all these countries; and in thy seed shall all the nations of the earth be blessed;