Show me in the Bible where He created nations. When He created mankind, all was one.
When God created mankind there was ONE man. It took some population growth before nations were made.
Acts 17:26 (AKJV/PCE)
(17:26) And hath made of one blood all nations of men for to dwell on all the face of the earth, and hath determined the times before appointed, and the bounds of their habitation;
Gen 17:5 (AKJV/PCE)
(17:5) Neither shall thy name any more be called Abram, but thy name shall be Abraham; for a father of many nations have I made thee.
Agreed, there will be nations after the incidents in Revelation are complete. I can't speak for all eternity, nor can God, for that matter.
God cannot? How do you come to that conclusion?
Revelation 21 is where the new Jerusalem and the new earth are established. Are you convinced that this is not the eternal state of the world?