Question

why does roosevelt use repetition in his request for a declaration of war?
○ to highlight his own credibility
○ to provide alternative courses of action
○ to compare the experiences of countries
○ to emphasize the threat posed by japan

Explanation:

Repetition in a speech like Roosevelt's request for a declaration of war is a rhetorical device. Its main purpose is to draw attention to a key point. In this context, the key threat was Japan. Highlighting credibility (which would be more about his character statements), providing alternative actions (he was asking for war, not alternatives), or comparing country experiences (not the focus here) are less relevant. The goal of repetition was to drive home the idea of the Japanese threat.

Answer:

to emphasize the threat posed by Japan