On March 18, 1922, Mohandas K. Gandhi was sentenced in India to six years’ imprisonment for civil disobedience. (He was released after serving two.)

In 1925, nearly 700 people died when the Tri-State Tornado struck southeastern Missouri, southern Illinois and southwestern Indiana. It remains the deadliest single tornado in U.S. history.

In 1942, President Franklin D. Roosevelt signed an executive order authorizing the War Relocation Authority, which forced Japanese Americans into internment camps during World War II.

In 1965, the first spacewalk took place as Soviet cosmonaut Alexei Leonov went outside his Voskhod 2 capsule, secured by a tether.

In 2018, a self-driving Uber SUV struck and killed a pedestrian in Tempe, Arizona, in the first death involving a fully autonomous test vehicle.