The assassination had an effect on many people, not only in the United States but around the world. Many vividly remember where they were when they first learned the news that Kennedy was assassinated, as with the Japanese attack on Pearl Harbor on December 7, 1941, before it and the September 11 attacks after it. UN Ambassador Adlai Stevenson II said of the assassination: "All of us. ... . will bear the grief of his death until the day of ours." Many people have also spoken of the shocking news, compounded by the pall of uncertainty about the identity of the assassin(s), the possible instigators, and the causes of the killing, as an end to innocence, and in retrospect it has been coalesced with other changes of the tumultuous decade of the 1960s, especially the Vietnam War.