Read the excerpt from "Keynote Address."At a time when guns are still heard in some areas of the world, we have laid in place such building blocks of mankind’s survival as the nuclear test ban treaty of 1963, the banning of atomic weapons in space of 1967, and the nuclear non-proliferation treaty of 1968. These are vital foundations, vital foundations of peace, and we must build on them.

The speaker supports the claim that peace has important foundations by naming specific treaties and the years they were established: 1963, 1967, and 1968. Using concrete facts and examples to support an argument is an appeal to logic. The phrase “at a time when guns are still heard” adds urgency, but the main support comes from the factual list of treaties.

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