Answer:
He opens his speech with a sentence referring to “a date which will live in infamy" to grab his audience's attention.
Explanation:
The anecdote about the Japanese ambassador is important for the idea of the Day of Infamy as it points out the nature of the happenings in the Pearl Harbour.
President Roosevelt refers to the diplomatic relations between Japan and the USA, as he was saying that the Japanese ambassador was communicating with the USA after the attack on Pearl Harbour was underway.
The main idea of this speech is the Japanese trait of the trust of the USA.
He opens his discourse with a sentence alluding to a date which will live in ignominy to catch his crowd's eye.
The story about the Japanese envoy is significant for the possibility of the Day of Infamy as it brings up the idea of the happenings in the Pearl Harbor.
President Roosevelt alludes to the discretionary relations among Japan and the USA, as he was saying that the Japanese envoy was speaking with the USA after the assault on Pearl Harbor was in progress.
The principle thought of this discourse is the Japanese characteristic of the trust of the USA.
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