The attack led to the US joining World War II
Franklin D. Roosevelt, the 32nd president of the United States, gave his renowned Infamy Speech to a Joint Session of Congress on December 8, the day following the attack. Roosevelt began his statement by stating, "Yesterday, December 7, 1941 - a date which will live in infamy..." His use of the passive phrase, "The United States was... attacked," which was opposed to the more active "Japan attacked the United States," was deliberate in order to highlight how severe the attack was and stated that the United States was the victim.
He urged war against Japan. The speech immediately received a positive welcome response and left a lasting impression. It is among the most well-known political speeches in American history. With over 81 percent of listeners tuned in to hear the address, it attracted the greatest audience in American radio history and was broadcast live. Within an hour of the speech, Congress formally declared war on the Japanese Empire. Later, a number of telegrams complimenting Roosevelt's position were sent to the White House.
Three days later, Japan’s allies, namely Germany and Italy, issued a declaration of war against the US, and that same day, the US also declared war against them. As a result, America joined the Second World War, which led to the bombing of Nagasaki and Hiroshima.
