Highlights of Libya's evolution during the rule of Moammar Gadhafi and his relations with the United States:

Sept. 1, 1969 _ Libyan military officers depose the conservative monarchy of King Idris and adopt as their slogan ``socialism, unity and freedom.'' Col. Moammar Gadhafi emerges as leader of the revolutionary government and orders the closure of a U.S. Air Force base. The last U.S. servicemen leave in June 1970.

Dec. 2, 1979 _ Some 2,000 Libyans ransack the U.S. Embassy in Tripoli. They chant support for the radical Islamic regime that had taken power in Iran earlier in the year.

Aug. 12, 1981 _ President Reagan, citing alleged Libyan involvement in terrorism, orders U.S. jets to attack targets in Libya.

Dec. 11, 1981 _ Concerned about the safety of Americans in Libya, the Reagan administration asks them to leave. It also invalidates use of U.S. passports for travel to Libya.

April 14, 1986 _ Convinced that Libya was responsible for a bombing at a Berlin discotheque frequented by American servicemen, Reagan order U.S. Air Force and Navy jets to attack five targets in Libya. An estimated 40 Libyans are killed, including Gadhafi's baby daughter.

Dec. 21, 1988 _ Pan Am Flight 103, with 259 people aboard, most of them Americans, is bombed over Lockerbie, Scotland. All aboard the U.S.-bound flight perish, along with 11 more on the ground.

April 15, 1992 _ U.N. Security Council imposes arms sales and air travel sanctions against Libya to prod Gadhafi into surrendering two suspects wanted in the Pan Am 103 bombing.

April 14, 1999 _ Libya surrenders the two Libyans for trial by a Scottish court sitting in the Netherlands. The U.N. Security Council quickly suspends sanctions but does not lift them _ meaning they can be reimposed. The Clinton administration says U.S. support for a formal lifting of sanctions must await payment of appropriate compensation to families of the victims and cooperation with the Pan Am 103 investigation and trial, consistent with U.N. Security Council demands.