Hi @melip, I don't know if you've watched the news lately, but for most people, "race," as in nationality, is a huge topic.
It's true that in heaven there will be people of all nations.
Your thoughts are lovely, and I mean that, but throughout history, wars have been fought for land and nations and regardless of our views, those things will continue until the very end.
The prayer in Chronicles 7:14, was actually aimed at Isreal alone. Not all nations. During that time, Israel was the nation chosen to shine a light out to the world. Because God is the same yesterday, today and forever, it applies to those who follow Him in Christ Jesus. And that definitely does not include all nations as a whole.
Thinking that by just saying that there is "one race," and "one land," is actually denying the reality that the world has never agreed with that, nor will it be until the return of Jesus.