Possessives of Proper Names With Internal Plural

 

Is it "The United States' history" or "The United States's history"? Do you treat States like a plain-old plural possessive, which never takes an extra s after the apostrophe (the three states' primaries), or do you treat it like a proper noun, which in Chicago style does take an extra s after the apostrophe (James's house)? Here's what you need to know.

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