What is the most likely reason Roosevelt uses the phrase “unprovoked and dastardly” to characterize the attack on Pearl Harbor?

The words “unprovoked and dastardly” condemn the attack as unjust and dishonorable. Roosevelt uses that moral judgment to persuade Americans that responding with war is justified and honorable. The phrase is not mainly about the Allies, Japanese citizens generally, or the attack’s effects on Hawaii.

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