Napoleonic Wars: Austrian forces repel French troops in the Battle of Arcis-sur-Aube.
Otto von Bismarck is appointed Chancellor of the German Empire.
World War I: The first phase of the German Spring Offensive, Operation Michael, begins.
World War II: British troops liberate Mandalay, Burma.
Apartheid: Sharpeville massacre, South Africa: Police open fire on a group of unarmed black South African demonstrators, killing 69 and wounding 180.
Dr. Martin Luther King, Jr. leads 3,200 people on the start of the third and finally successful civil rights march from Selma to Montgomery, Alabama.
US President Jimmy Carter announces a United States boycott of the 1980 Summer Olympics in Moscow to protest the Soviet war in Afghanistan.
Pope John Paul II makes his first ever pontifical visit to Israel.
The social media site Twitter is founded.