Day of Infamy speech
Franklin D. Roosevelt asked a joint session of Congress to declare war on Japan in the early afternoon of December 8, 1941, and the whole address runs about six and a half minutes. On film you see what radio listeners could only imagine: a president delivering a short, flat list of Japanese attacks rather than soaring rhetoric, and the chamber's response. His early draft called it a date which will live "in world history"; he changed it to "in infamy." Congress declared war 33 minutes after he finished, which makes this the rare speech whose consequence arrived the same afternoon.
More about Day of Infamy speech