Which argument technique is used in the line, "Today I have stood, where once Jefferson Davis stood"?

The technique used in the line, "Today I have stood where once Jefferson Davis stood" is ethos. Ethos is where an argument is based upon the credibility of the speaker/writer. Thus, because Jefferson Davis can be seen to be a person of stature, to be speaking/writing to one from where one of greatness once was can be seen to appeal to the ethos of those being spoken/written to.