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:

In his 1941 request for a declaration of war against Japan, Roosevelt uses repetition (such as referencing repeated Japanese attacks across multiple Pacific locations) to drive home the severity and scale of the threat Japan posed to the U.S. and its interests, building urgency for congressional approval of war. The other options do not align: repetition does not focus on his credibility, offer alternative actions, or compare country experiences.

Answer:

to emphasize the threat posed by Japan