The powerful words Roosevelt used in the address gave strong support that grabbed the American peoples' attention, and. One convincing statement he makes was when he said, "The United States of America was suddenly and deliberately attacked by naval and air forces of the Empire of Japan." Roosevelt wanted to be sure that the congress and the nation knew the facts behind the tragedy. In that short statement he informs the people that he had no idea that the attack was coming, in his words the attack came suddenly.
He also tries to explain Americas relationship with Japan before the attack in this section, "The United States was at peace with that nation and, at the solicitation of Japan, was still in conversation with its government and its emperor looking toward the maintenance of peace in the Pacific." That showed the American people what events had taken place prior to the disaster at Pearl Harbor. He wanted the people to know that he was under the impression that the two nations were at peace, and that they were nowhere near a state of war.
Another purpose for the address was that Roosevelt wanted to justify going to war with the Empire of Japan. One such section of the speech was when Roosevelt said, "The distance of Hawaii from Japan makes it obvious that the attack was deliberately planned many