Question

Five score years ago, a great American, in whose symbolic shadow we stand today, signed the Emancipation Proclamation. This momentous decree came as a great beacon light of hope to millions of Negro slaves who had been seared in the flames of withering injustice. It came as a joyous daybreak to end the long night of their captivity. LOGOS,

WHY IS IT LOGOS??

Answer 1

LOGOS can mean a lot of things.
Some of the meanings are the rational principle that governs and develops the universe. The divine word or reason incarnate in Jesus Christ. A high-level programming language widely used to teach children how to use computers. Or like I said early, it can also mean a graphic representation or symbol of a company name, trademark, abbreviation, etc.

Answer 2

Logos refers to a rhetorical device in which a speaker uses arguments and evidence in order to persuade an audience of a particular opinion. This is one of the most common modes of persuasion, along with ethos and pathos.

In this case, the author can be considered to be using logos because he uses concrete evidence to persuade the audience. This evidence is that of the Emancipation Proclamation and the reference to Abraham Lincoln.