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9 After this I beheld, and, lo, a great multitude, which no man could number, of all nations, and kindreds, and people, and tongues, stood before the throne, and before the Lamb, clothed with white robes, and palms in their hands; 10And cried with a loud voice, saying, Salvation to our God which sitteth upon the throne, and unto the Lamb.

Nation at that time meant race or ethnicity. The nations will survive to the end and are important enough of a distinction that it's preserved at least partially in our heavenly form.