After January 31, 1999, which signaling system ceased to be an official channel of maritime distress communication?

After Italy invaded Ethiopia in 1935, which emperor made a famous but vain plea to the League of Nations for help? After its 1980 eruption, which volcano in the American Northwest lost over 1,200 feet in height? After landing on Mars on July 4, 1997, which NASA lander was renamed the Carl Sagan Memorial Station? After President Fernando de la Rua resigned in December 2001, Adolfo Rodriguez Saa held the presidency of which country… The 1360 Peace of Bretigny, signed after John II's defeat at the Battle of Poitiers in 1356, ended the first phase of w… After John Milton died in 1674, his widow sold all her remaining rights to which of his works for just 8 pounds? After Lyndon Johnson's death in 1973, NASA's Manned Spacecraft Center in which city was renamed in his honor? Which pair's expedition finally reached the Pacific Ocean in November 1805 after a journey of thousands of miles?