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  1. International Workers' Day - Wikipedia

  2. May 1 - Wikipedia

  3. May Day ‑ Meaning, Date & Workers Day - HISTORY

  4. May Day - Wikipedia

  5. May Day | History, Meaning, Traditions, & Facts | Britannica

  6. Historical Events on May 1 - On This Day

  7. The history of May Day in America : NPR

  8. May Day 2025: What Is May Day? - The Old Farmer's Almanac

  9. May Day History: How May 1 Became a Holiday for Workers - TIME

  10. On This Day - What Happened on May 1 | Britannica - Encyclopedia Britannica