Final answer:
The student's question focuses on assessing the strength of the cases for war presented by President Franklin Roosevelt and Emperor Hirohito during World War II. Since information about Hirohito's case is not provided, the answer focuses on Roosevelt's 'Day of Infamy' speech, which offers a strong rationale for declaring war due to the unprovoked attack on Pearl Harbor.
Step-by-step explanation:
The question pertains to an essay comparing President Franklin Roosevelt’s and Emperor Hirohito’s rationale for declaring war during World War II. President Roosevelt was forced into war by the attack on Pearl Harbor, a move that prompted his famous Day of Infamy speech. Roosevelt addressed Congress, using rhetorical strategies to underscore the secretive and deliberate nature of the attack by Japan.
In the case of Emperor Hirohito, we would have to seek out his speeches and messages to Japanese citizens and allies during the time. However, as this information is not provided, we can only refer to Roosevelt's logic in declaring war.