1 Peter 2:9 (NIV)
9 But you are a chosen people, a royal priesthood, a holy nation, God’s special possession, that you may declare the praises of him who called you out of darkness into his wonderful light.

Job 12:23-24 (NIV)
23 He makes nations great, and destroys them; he enlarges nations, and disperses them.
24 He deprives the leaders of the earth of their reason; he makes them wander in a trackless waste.

Biblical Points on this reality of Nations:
First point is that there is a difference between the Holy Nation and Other Natural Nations.
Second Point is that the Holy Nation is ushering in the Kingdom of God that will eventually crush all nations and rule over them.
Third Point is that history is riddled with misunderstandings of this and spiritual warfare attempts to inter-marry Holy Nation and Natural Nations.
Fourth Point is that eventually the Holy Nation will tie All Nations with Jesus in the Millennial Reign and New Heaven and Earth, and that timing is essential.