Instructions: Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.
Input: Sentence: 'They were spoken by Jefferson Davis , the president of the Confederate States of America , on an evening ride following the Battle of Seven Pines .', Argument/Subject 1: 'jefferson davi', Argument/Subject 2: 'confederate state of america'
Output:
be president of