1968: Robert Kennedy is assassinated on June 5 after giving a campaign speech in California Sirhan Sirhan is convicted of the crime and sentenced to life in prison.

1995: Israeli president Itzak Rabin is assassinated in November after giving a speech at a peace rally.

1968: Many American young people become active in protest causes. College students, in particular, stage many campus protests of the Vietnam War. The voting age is lowered to eighteen in 1971, in response to those who criticize the fact that teenagers are old enough to be drafted into war, but not old enough to vote.

1990s: In 1994, only 12 percent of 18 and 19year olds voted. In the presidential election of 1996, only about 49 percent of the country's eligible voters cast ballots, and only 17 percent of those voters were under 30 years old.

1960s: As Attorney General under his brother, President John F. Kennedy, Robert Kennedy is actively...