National Pearl Harbor Remembrance Day

National Pearl Harbor Remembrance Day, also referred to as Pearl Harbor Remembrance Day or Pearl Harbor Day, is observed annually in the United States on December 7, to remember and honor the 2,403 United States citizens who were killed in the Japanese surprise attack on Pearl Harbor in Hawaii on December 7, 1941, which led to the United States declaring war on Japan the next day and thus entering World War II.

https://en.wikipedia.org/wiki/National_Pearl_Harbor_Remembrance_Day