100% verified The same day, three eras.
17 September
Contemporary era
1939
Soviet invasion of Poland
On 17 September 1939, the Soviet Union invaded eastern Poland.
Sources and verification (1)
- Encyclopaedia Invasion sovietique de la Pologne (Wikipedia) Wikipedia. 4/5
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Contemporary era
1862
Battle of Antietam
On 17 September 1862, the Battle of Antietam was the bloodiest day of the American Civil War.
Sources and verification (1)
- Encyclopaedia Bataille d'Antietam (Wikipedia) Wikipedia. 4/5
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From the Middle Ages to the Enlightenment
1787
US Constitution signed
On 17 September 1787, the Philadelphia Convention signed the US Constitution.
Sources and verification (1)
- Encyclopaedia Constitution des Etats-Unis (Wikipedia) Wikipedia. 4/5