Webster, Worcester, and Bouvier all define a citizen to be a person in the United States, entitled to vote and hold office.

The only question left to be settled now is: Are women persons?

This passage is an example of

logos

ethos

At first glance, the passage seems like an appeal to ethos because of the name dropping. However, if one looks at the question that follows the statement, you can clearly see that it is an appeal to logos. As it persuades the audience to use their logic to come up with the answer to the question.