Crossword Genius

Where to send a letter to Uncle Sam (3)

Ross

I believe the answer is:

usa

I'm a little stuck... Click here to teach me more about this clue!

This clue might be a double definition.

'where to send a letter' is the first definition.
The answer is a location as well as being a singular noun. This is suggested by the definition.

'uncle sam' is the second definition.

'to' acts as a link.

Can you help me to learn more?

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

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