In 1822, the design of the modern Greek flag was officially adopted.
In 1888, the National Geographic Society was founded in Washington, D.C.
In 1966, Robert C. Weaver was named Secretary of Housing and Urban Development, becoming the first African-American Cabinet member.
In 1968, Johnny Cash performed live at Folsom State Prison in California.
In 2001, an earthquake in El Salvador killed more than 800.
In 2021, President Donald J. Trump was impeached a second time.