Part A:What Roosevelt’s overall purpose in his speech?

He sought to emphasize the historic nature of the events at Pearl Harbor, implicitly urging the American people never to forget the attack and memorialize its date. Notwithstanding, the term "day of infamy" has become widely used by the media to refer to any moment of supreme disgrace or evil.

Explanation:

the answer is:

in the fourth paragraph. ( the paragraph that begins with “on friday of my third ”).

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