On April 22, 1970, millions of Americans participated in the first Earth Day. The event brought together students, activists, and citizens concerned about pollution and environmental damage. Rallies, teach-ins, and community cleanups took place in cities and towns across the country. Earth Day helped raise public awareness of issues like air and water pollution, endangered species, and toxic waste. Its success encouraged lawmakers to pass major environmental laws in the 1970s. The day has since grown into a global observance focused on environmental protection.