- Sep 9 California is admitted as the thirty-first state of the Union
- Sep 9 Territories of New Mexico & Utah created
The Swedish Nightingale
Sep 11 Opera singer Jenny Lind - "The Swedish Nightingale", gives 1st US concert, at Castle Garden in New York City, promoted by P. T. Barnum
Compromise of 1850
Sep 18 US Congress passes Fugitive Slave Law as part of Compromise of 1850, requires slaves be returned to their owners
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