All nations fall and Jesus Christ reigns. After the judgment of the nations, Jesus Christ will rule the world. There will be a thousand years of peace on earth.
When the Son of man shall come in his glory, and all the holy angels with him, then shall he sit upon the throne of his glory: And before him shall be gathered all nations: and he shall separate them one from another, as a shepherd divides his sheep from the goats (Matthew 25:31-32).
References:
21st Century Revelation: World Wars, Iraq Wars & End Wars Chapter 20 - Players in the Game, Chapter 23 - World Wars, Cold Wars, Chapter 25 - World War III,
Olympic Games