How do I make “United States” possessive?

Is this correct punctuation? “What caused the United States’ entry into World War II?”
I know it isn’t United State’s.
I don’t think it is United States’
Joy S., El Paso, TX

Answer: The correct possessive for United States (a noun ending in ‘s’) requires adding a single apostrophe:
the United States’ entry into World War II, the United States’ role in world affairs.

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