What is one way the declaration appeals to ethos?

I'm assuming you are referring to the Declaration of Independence.

Ethos is an appeal to ethics. The principle of it is to prove to the reader that the writer is credible and reasonable. In the Declaration of Independence Jefferson does this very skillfully in the first line when he says that the declaration is written out of respect for those that must judge the rightness or wrongness of the colonies decision to break away from Great Britain. This establishes his credibility.

it u understand what he thought at the time and let u know more about him then what third person would of known probably. hope this : )