We can actually deduce here that the tone of the speech from “Thomas Jefferson's Second Inaugural Address” is: serious.
What is tone?
Tone refers to the attitude of a speaker to the subject he is writing about and that is seen in his use of language. Tone also creates the mood of the readers reading a particular passage or subject.
Attached to this answer is the complete part of the question.
Thus, we see that the tone is actually serious.
Learn more about tone on https://brainly.com/question/23211870
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