Which aspect of roosevelt's "fireside chat 19" was most important in him achieve his purpose of preparing americans for war ? a. his summary of japan's past pattern of aggressive behavior b, his statement that american newspaper could demand more information c. his call to americans to be willing to endure shortage to the war effort d. his reminder that japan recently attacked pearl harbor

The correct answer is C. The aspect of Roosevelt's "Fireside Chat 19" that was most important in helping him achieve his purpose of preparing Americans for war was his call to Americans to be willing to endure shortage to help the war effort.

The "Fireside chats" were 30 radio speeches of U.S. President Franklin D. Roosevelt to the American people, between 1933 and 1944. In these, Roosevelt addressed key issues for the American society.

In the Fireside Chat 19, "On the Declaration of War with Japan", Roosevelt motivated the American people to collaborate with the efforts of the war, urging them to participate in the production and to support the possible economic imbalances and the scarcity that the war was going to generate in the daily economy.