Today in History: First Earth Day Observed

The first Earth Day in 1970 marked a pivotal moment in environmental activism, engaging millions of Americans in environmental conservation efforts.

On April 22, 1970, the first Earth Day was observed, drawing widespread participation across the U.S.
The event underscored growing public concern for environmental issues and spurred national and global environmental movements.
Key historical events on April 22 include the 1889 Oklahoma Land Rush and the 1915 use of chlorine gas in WWI.
Other significant April 22 occurrences: the 1993 dedication of the U.S. Holocaust Memorial Museum and the 2010 Deepwater Horizon oil spill.
Historical events of April 29 and 30 include Joan of Arc's 1429 battle and the 1975 end of the Vietnam War with the fall of Saigon.