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International Workers' Day - Wikipedia
May 1 - Wikipedia
May Day ‑ Meaning, Date & Workers Day - HISTORY
May Day - Wikipedia
May Day | History, Meaning, Traditions, & Facts | Britannica
Historical Events on May 1 - On This Day
The history of May Day in America : NPR
May Day 2025: What Is May Day? - The Old Farmer's Almanac
May Day History: How May 1 Became a Holiday for Workers - TIME
On This Day - What Happened on May 1 | Britannica - Encyclopedia Britannica