- For Teachers
However, if Syriaís civil war spills over into the rest of the Middle East, U.S. interests would be threatened.
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A Tip for the Possessive Apostrophe
There's no adjective "United Statean", but if there was, U.S. could just as easily stand for it as U.S.'s.
Similarly, "UK interests" could mean "the UK's interests".
Mostly, I think, it's just too messy to write U.S.'s, so an exception has been made.