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What are some of the biggest protests in U.S. history?

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The first Earth Day on April 22, 1970, was the largest single-day protest in U.S. history, with an estimated 20 million participants. Black Lives Matter (BLM) protests erupted nationwide following the murder of George Floyd on May 25, 2020, and continued well into August. An estimated 15–26 million people participated in these sustained protests, making BLM the largest protest movement in American history. There have been three “No Kings” protests—June 14, 2025, October 18, 2025, and March 28, 2026. An estimated 19–21 million people participated in these three nationwide protests. The participants rejected corruption, authoritarianism, immigration raids, federal troops in U.S. cities, executive branch overreach, the 2026 Iran War, and the rising cost of living.