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Events on Sunday 4 March 1849 1
1845 – 1849Polk presidency11th President — 1845 to 1849James K. Polk served as the 11th President from March 4, 1845 to March 4, 1849. He oversaw the annexation of Texas, negotiated Oregon with Britain, and won the Mexican-American War, adding 1.2 million square miles to the US.