10th anniversary (1994)
Nelson Mandela becomes president of South Africa.
Ethnic conflict results in the death of nearly one million in Rwanda.
20th anniversary (1984)
Indian prime minister Indira Gandhi is assassinated.
The AIDS virus is discovered.
The Domain Name System (DNS) is established, and .com, .org and .edu first appear.
The term ‘cyberspace’ is used for the first time, in Willam Gibson’s novel Neuromancer.
25th anniversary (1979)
The Shah of Iran flees the country, and an Islamic republic is founded under Ayatollah Khomeini. Later this year, 70 Americans are taken prisoner and held hostage for 444 days.
30th anniversary (1974)
The Irish Republican Army begins bombings in Ireland and the U.K..
The Watergate scandal leads to the resignation of U.S. president Richard Nixon.
40th anniversary (1964)
Beatlemania hits America.
The U.S. deploys its first combat troops to South Vietnam, starting the U.S.-Vietnam conflict.
50th anniversary (1954)
Racial segregation of American schools is declared unconstitutional.
U.S. senator Joseph McCarthy begins hearings to root out Communist ‘subversives’.
70th anniversary (1934)
Mao Zedong’s 9,600-km Long March begins.
The male hormone testosterone is isolated.
Germany opens the Autobahn, the first modern highway.
75th anniversary (1929)
In the U.S., ‘Black Friday’ sparks the economic slide into the Great Depression.
German scientist Fritz Lickint publishes the first statistical evidence linking tobacco to lung cancer.
90th anniversary (1914)
World War I begins.
The Panama Canal opens.
American naturalist John Muir dies.
100th anniversary (1904)
Silicone is discovered.
Auto company Rolls-Royce is founded.
150th anniversary (1854)
The Republican Party in the U.S. is founded.