Answer:
Pathos
Step-by-step explanation:
Pathos means "suffering and experience". In Aristotle's rhetoric, this translates into the ability of the speaker or writer to provoke emotions and feelings in his audience. Pathos is associated with emotion, refers to the appeal to the emotional side of the target audience. In short, pathos seeks to empathize with the public. When the speaker uses his values, his beliefs and understanding, he moves the audience and communicates with them through a story.
It is clear that the speaker is trying to appeal to the emotional side of the receiver of the message since the speaker uses terms like "Merciless Indian Savages" and "undistinguished destruction of all ages, sexes, and conditions". There's a clear emotional appeal.