Answer:
He uses ethos to establish his credibility as an informed leader.
Step-by-step explanation:
Ethos means character and comes from the word ethikos, which means moral and moral personality. For the speakers and writers, ethos is formed by its credibility and identification with the public. The speaker must be trusted and respected as an expert in the subject under review. For arguments to be effective, it is not enough to make logical reasoning. Content should also be presented efficiently to become trustworthy.
Based on this, we can affirm that Lincoln uses ethos to establish his credibility as an informed leader.