Correct answer: Martin Luther King, Jr., was assassinated.
Details:
Dr. Martin Luther King, Jr., was assassinated on April 4, 1968, at the Lorraine Motel in Memphis, Tennessee. He was one of America's greatest civil rights leaders.
Another civil rights activist, Malcolm X, was assassinated on February 21, 1965, at the Audubon Ballroom in Manhattan, New York.
President John F. Kennedy was assassinated on November 22, 1963, in Dallas TX.
The Cuban Missile Crisis was a 13-day confrontation over nuclear weapons that the USSR placed in Cuba. The crisis could have led to war, but that was averted. The standoff ended October 28, 1962.