The purpose of roosevelt's speech is mostly to boost morale among americans and reassure them that the military will take action against japan persuade congress that going to war with the japanese is necessary engage the audience by providing examples of the violence of the attack persuade congress and the american people that becoming involved in the war is a bad idea in spite of the attacks on pearl harbor

boost morale among Americans and reassure them that the military will take action against Japan.

Explanation:

In his speech, Roosevelt's main purpose was to boost morale after the Pearl Harbor attack. After this event, the American public was worried about the future, and nervous about the possibility of further attacks. Therefore, Roosevelt wanted to reassure Americans that their safety was the military's main concern. He also addresses them in order to explain his reasons for going to war against Japan.