Why is December 7 1941 known as a date which will live in infamy me?

December 7, 1941, is known as a date which will live in infamy because it marks the surprise attack by the Japanese Imperial Navy on Pearl Harbor, Hawaii. This devastating assault led to significant loss of life and damage to the U.S. Pacific Fleet, prompting the United States to formally enter World War II. President Franklin D. Roosevelt famously referred to this day in his speech to Congress, emphasizing the shock and outrage felt by the nation, which galvanized public support for the war effort.