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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.
The kind of argument used in the line as described is; Ethos (whose definition is characterized by an aim to appeal to an audience's ethics.
Ethos elements in Argument
Ethos by definition refers to any element of an argument that is aimed at appealing to an audience's ethics or ethical responsibilities. A writer generally utilizes the three appeals in order to convince his audience of his argument. The other two appeals are pathos (emotion) and logos (logic).
On this note, it can be concluded that the argument technique used in the line is; Ethos.
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