Final answer:
In AP Style, the correct abbreviation for 'United States' when used as an adjective is 'U.S.', ensuring consistency in its usage throughout the text.
Explanation:
In AP Style, the correct way to abbreviate 'United States' when used as an adjective is: U.S.
This abbreviation is commonly used in journalistic writing to save space and maintain a concise style.
It is important to be consistent with using this abbreviation throughout the text when referring to 'United States' in an adjectival form.
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