Answer: The answer is Reciprocity.
Explanation: This is an act that happens when a state (A) grants the same right and privileges to other individuals or citizens from another state (B) as it would to its own individuals or citizens. The same act is expected to be reciprocated from the state (B) to individuals or citizens from state (A). Thus the word 'reciprocity' was given to this act and coined from the word 'reciprocate'.