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September 15 - Wikipedia
Historical Events on September 15 - On This Day
September 15th Holidays - National Today
Why Hispanic Heritage Month starts in the middle of September
What Happened on September 15 - On This Day
Hispanic Heritage Month ‑ Origins & Facts - HISTORY
Events in History on September 15 - On This Day
On This Day - What Happened on September 15 | Britannica
What Happened on September 15 - HISTORY
More on this Day - September, 15 | Britannica - Encyclopedia Britannica