Where did the 1st earth day take place?

The first Earth Day took place on April 22, 1970, in the United States, with significant events occurring in cities like San Francisco, New York, and Washington, D.C. Organized by Senator Gaylord Nelson, the day aimed to raise awareness about environmental issues and mobilize public support for environmental protection. It marked a pivotal moment in the modern environmental movement, leading to the establishment of the U.S. Environmental Protection Agency and the passage of key environmental legislation.