February 24, 1909 (Wednesday)
- An international crisis began when the Kingdom of Serbia announced that it opposed Austria-Hungary's annexation of Bosnia and Herzegovina, and that the area should be part of a Greater Serbia. The Austro-Hungarian Empire prepared to go to war with Serbia, which backed down at the end of March.
- The United States Senate ratified the Ship Canal treaty that had been signed with Colombia on January 9.
- Grant County, Washington, was established from the southern section of Douglas County, and named in honor of Ulysses S. Grant.
- Born: August Derleth, American writer, in Sauk City, Wisconsin (d. 1971)
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