Nation conspicuously missing from the Wilson-proposed League of Nations, in brief

I believe the answer is:

usa

(Other definitions for usa that I've seen before include "11 Nation" , "A great national federation" , "Initially, a great federation" , "Union" , "United States" .)

I've seen this clue in The New York Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.