You know what it looks like… but what is it called?
TAKE THE QUIZ“[States']”
The following 2 entries include the term [States'].
states' righter
noun: a person who advocates strict interpretation of the U.S. constitutional guarantee of states' rights
states' rights
plural noun: the rights and powers held by a state, province, etc., that is a member of a federal union
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Merriam-Webster unabridged