| 1 | 1 | U.S. drops atomic bomb | 1945 |
| 2 | 3 | Japan bombs Pearl Harbor | 1941 |
| 3 | 2 | Men first walk on the moon | 1969 |
| 4 | 4 | Wrights fly first airplane | 1903 |
| 5 | 6 | JFK assassinated in Dallas | 1963 |
| 6 | 11 | Antibiotic penicillin discovered | 1928 |
| 7 | 5 | U.S. women win the right to vote | 1920 |
| 8 | 10 | U.S. stock market crashes | 1929 |
| 9 | 21 | New polio vaccine works | 1953 |
| 10 | 12 | DNA's structure discovered | 1953 |
| 11 | 7 | Nazi Holocaust exposed | 1945 |
| 12 | 19 | Einstein conceives relativity | 1905 |
| 13 | 36 | 'Unsinkable' Titanic sinks | 1912 |
| 14 | 17 | Ford creates assembly line | 1913 |
| 15 | 8 | World War I begins | 1914 |
| 16 | 27 | Berlin Wall falls | 1989 |
| 17 | 51 | First computer chip patented | 1959 |
| 18 | 25 | Deadly AIDS disease identified | 1981 |
| 19 | 30 | Lindbergh flies Atlantic alone | 1927 |
| 20 | 52 | Radio signal spans Atlantic | 1901 |
| 21 | 13 | Soviet Union dissolves | 1991 |
| 22 | 32 | World Wide Web invented | 1989 |
| 23 | 24 | Allies invade France on D-Day | 1944 |
| 24 | 37 | U.S. celebrates V-E Day | 1945 |
| 25 | 42 | ENIAC accelerates computing | 1946 |
| 26 | 38 | Roe vs. Wade legalizes abortion | 1973 |
| 27 | 28 | Official U.S. debut of TV | 1939 |
| 28 | 46 | Plastic revolutionizes products | 1909 |
| 29 | 20 | Birth control pill OK'd by FDA | 1960 |
| 30 | 9 | Court ends 'separate but equal' | 1954 |
| 31 | 53 | President Clinton impeached | 1998 |
| 32 | 33 | Scientists invent transistor | 1948 |
| 33 | 23 | M.L. King Jr. assassinated | 1968 |
| 34 | 26 | Congress OKs Civil Rights Act | 1964 |
| 35 | 88 | U.S. enters World War I | 1917 |
| 36 | 16 | Communists take over Russia | 1917 |
| 37 | 40 | U.S. radio broadcasts begin | 1909 |
| 38 | 50 | King delivers 'Dream' speech | 1963 |
| 39 | 14 | President Nixon resigns | 1974 |
| 40 | 81 | Panama Canal opens | 1914 |
| 41 | 15 | Germany invades Poland | 1939 |
| 42 | 34 | FDR's New Deal begins | 1933 |
| 43 | 83 | Shuttle Challenger explodes | 1986 |
| 44 | 66 | Shepard first American in space | 1961 |
| 45 | 57 | 'Silent Spring' warns of eco-danger | 1962 |
| 46 | 69 | World's nations form U.N. | 1945 |
| 47 | 79 | Scientists clone sheep | 1997 |
| 48 | 18 | Soviets launch first satellite | 1957 |
| 49 | 39 | World War I ends | 1918 |
| 50 | 60 | Gagarin first man in space | 1961 |
| 51 | 45 | Israel achieves statehood | 1948 |
| 52 | 43 | U.S.-licensed TV begins | 1941 |
| 53 | 48 | U.S. tests atomic bomb | 1945 |
| 54 | 55 | Robert F. Kennedy slain | 1968 |
| 55 | 22 | Hitler named chancellor | 1933 |
| 56 | 41 | Flu epidemic kills 20 million | 1918 |
| 57 | 90 | Glenn first American in orbit | 1962 |
| 58 | 97 | Gates, Allen start Microsoft | 1975 |
| 59 | 44 | Robinson integrates baseball | 1947 |
| 60 | 73 | U.S. troops leave Vietnam | 1973 |
| 61 | 78 | Quantum mechanics proposed | 1900 |
| 62 | 64 | Secret project to make A-bomb | 1942 |
| 63 | 80 | Interstate highways approved | 1956 |
| 64 | 65 | GI Bill of Rights strengthened | 1945 |
| 65 | 62 | U.S. escalates Vietnam War | 1965 |
| 66 | 71 | Gandhi starts nonviolent reform | 1920 |
| 67 | 95 | First 'test-tube baby' born | 1978 |
| 68 | 35 | World crisis over Cuba missiles | 1962 |
| 69 | 68 | Quake, fire devastate S.F. | 1906 |
| 70 | 49 | Apartheid ends in South Africa | 1993 |
| 71 | 31 | Apple II first mass-market PC | 1977 |
| 72 | 58 | Beatles tour USA | 1964 |
| 73 | 47 | Alabama bus boycott begins | 1955 |
| 74 | 99 | Scopes: evolution vs creation | 1925 |
| 75 | 61 | First jet plane takes off | 1939 |
| 76 | 93 | Hitler launches 'Kristallnacht' | 1938 |
| 77 | 76 | FDR defeats President Hoover | 1932 |
| 78 | 54 | Marshall Plan unveiled | 1947 |
| 79 | 92 | Pathfinder sends Mars photos | 1997 |
| 80 | 82 | Friedan sparks women's rights | 1963 |
| 81 | 89 | Babe Ruth hits 60 home runs | 1927 |
| 82 | 100 | U.S. warns of smoking hazards | 1964 |
| 83 | 94 | Churchill leads Great Britain | 1940 |
| 84 | 74 | NATO established | 1949 |
| 85 | 98 | Chernobyl nuke plant explodes | 1986 |
| 86 | 70 | Berlin Wall goes up | 1961 |
| 87 | 29 | Mao starts communist China | 1949 |
| 88 | 67 | Watergate engulfs Nixon | 1973 |
| 89 | 77 | Gorbachev begins 'glasnost' | 1985 |
| 90 | 86 | Freud interprets dreams | 1900 |
| 91 | 96 | Airlift saves West Berlin | 1948 |
| 92 | 84 | U.S. defends South Korea | 1950 |
| 93 | 75 | Soviet famine to kill 25 million | 1928 |
| 94 | 56 | U.S. rejects League of Nations | 1920 |
| 95 | 72 | Standard Oil trust busted | 1911 |
| 96 | 59 | Congress passes voting act | 1965 |
| 97 | 87 | China's famine to kill 20 million | 1958 |
| 98 | 85 | Riots at Democratic convention | 1968 |
| 99 | 63 | North Vietnam takes Saigon | 1975 |
| 100 | 91 | Gulf of Tonkin Resolution OK'd | 1964 |
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