Crossword Genius

Letters on outdated maps (4)

Ross

I believe the answer is:

ussr

(Other definitions for ussr that I've seen before include "Former association of communist republics" , "Former federation of Russial and other states" , "Former soviet states" , "In brief, former Soviet federation" , "Country established in 1922 and dissolved in 1991, in short" .)

I've seen this clue in the LA Times.
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