◆ On this day

September 17

3 sourced moments from September 17 in history: The U.S. Constitution was signed in Philadelphia (1787); The Battle of Antietam became the bloodiest day in U.S. history (1862); and The first airplane passenger fatality occurred (1908).

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3 things happened on September 17

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1908 Technology · Transportation

The first airplane passenger fatality occurred

On September 17, 1908, a broken propeller turned an Army demonstration flight into aviation's first fatal crash, killing Lt. Thomas Selfridge.

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1862 History · War & Conflict

The Battle of Antietam became the bloodiest day in U.S. history

On September 17, 1862, a single day's fighting near Sharpsburg left some 23,000 men dead, wounded, or missing—the deadliest day in American history.

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1787 Society & Economy · Politics & Law

The U.S. Constitution was signed in Philadelphia

On September 17, 1787, after a summer of secret debate, 39 delegates signed the document that still frames American government.

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