SEM By vrijesakm Period: Sep 30, 1970 to Sep 30, 1990 SEM Jun 30, 1971 Voting Age Lowered to 18 Nov 14, 1971 NASA and the Soviets send probes to Mars Sep 21, 1972 Martial Law Declared Jan 18, 1977 Legoinnaire's Disease Source Identified Mar 30, 1981 Assasination Attempt on Ronald Regean Aug 1, 1981 The Birth of MTV Jun 18, 1983 First Woman in Space Jan 28, 1984 Michael Jackson's Hair Catches on Fire Jan 28, 1986 Challenger Explodes Nov 9, 1989 The Fall of the Berlin Wall