This one is pretty simple! The answer is has.
The verb tense and aspect of this sentence is past progressive.
Answer:
To draw attention and highlight the importance of your speech.
Explanation:
Jefferson uses strong and powerful language to evoke attention to his speech and reaffirm the importance that his words have within that theme. Thus he captures the public's reasoning, which is bound by the seriousness and acidity that the discourse imposes through the arguments presented.
In short, the language chosen by Jefferson is used to emphasize, bring focus and importance to his arguments.
