Final answer:
President Franklin D. Roosevelt's use of repetition in starting paragraphs of his speech with "Last night, Japanese forces..." effectively emphasizes the urgency and scale of the surprise Japanese offensive, thereby justifying the call for a declaration of war.
Step-by-step explanation:
The question asks why President Franklin D. Roosevelt starts paragraphs 8-11 of his "Day of Infamy" speech with little variation of the words "Last night, Japanese forces..." This repeated structure is effective in Roosevelt's argument because it emphasizes the extent and surprise of the Japanese offensive. By starting each statement with the same words, Roosevelt creates a rhythmic cadence that not only captures the audience's attention but also accentuates the immediacy and breadth of the attack. Imminent danger is underscored by this structure, reinforcing the severity of the situation faced by the United States and highlighting the need for a call to action.
The use of repetition lends a sense of urgency and dramatizes the series of events that unfolded. It reinforces in the listener's mind the unprovoked and widespread nature of the Japanese attacks, thus supporting Roosevelt's case for declaring war. Moreover, the surprise offensive throughout the Pacific area is crystallized through this rhetorical choice, leading the listener to understand the necessity for immediate and conclusive action by the nation.