Question

read this sentence from president franklin d. roosevelts \address to congress requesting a declaration of war.\
i ask that the congress declare that since the unprovoked and dastardly attack by japan on sunday, december 7, 1941, a state of war has existed between the united states and the japanese empire.
which key idea does roosevelt refine in this sentence?
he is calling on congress to investigate japanese acts of aggression to determine if they are serious enough to go to war.
he is establishing that the long - term conflict that has existed between the united states and japan could be ended by war.
roosevelt wants congress to grant him the power to declare war himself, rather than wait for their approval.
he is again emphasizing japans deception and unprovoked attacks as reasons for the united states go war with japan.

Explanation:

Roosevelt's sentence frames the Japanese attack as unprovoked and dastardly, then asks Congress to declare that a state of war already exists. This refines the core idea that the unprovoked attack justifies the U.S. entering war, by explicitly tying the attack to the formal request for a war declaration. The other options are incorrect: he is not asking for an investigation, not framing war as an end to long-term conflict, and not seeking power to declare war himself.

Answer:

He is again emphasizing Japan's deception and unprovoked attacks as reasons for the United States go war with Japan.