Final answer:
President Franklin D. Roosevelt's "Four Freedoms" speech uses logos by using historical evidence to argue against appeasement and highlighting the necessity of the four essential human freedoms through rational argumentation.
Step-by-step explanation:
President Franklin D. Roosevelt's "Four Freedoms" speech employs logos as a rhetorical strategy when it appeals to logic and reason. This can be identified in statements where he details the consequences of appeasement and the need for certain freedoms. For example, Roosevelt's assertion that "if history teaches anything, it teaches that simpleminded appeasement or wishful thinking about our adversaries is folly" uses historical evidence to logically argue against appeasement policies.
He rationalizes the essential nature of the four essential human freedoms, which include freedom of speech, freedom of worship, freedom from want, and freedom from fear. Each of these freedoms connects to fundamental human rights and proposes a logical framework for a peaceful and secure world. Hence, this part of the speech demonstrates a clear use of logos by relying on rational argumentation to persuade the audience.