Part a what is one of roosevelt's purposes for delivering this speech? to ask congress to declare war on japan to explain why japan attacked pearl harbor to explain to congress why war is important to tell the american people his thoughts on war part b how does roosevelt use rhetoric to advance his purpose identified in part a? he ends the speech with a call to action, encouraging congress to declare war on japan. he ends the speech with a direct appeal for all americans to seek revenge for pearl harbor. he ends the speech with an extended metaphor meant to garner support for war with japan. he ends his speech with a rhetorical question intended to motivate congress to discuss war in the pacific.