James Knox, 1795–1849, the 11th president of the U.S. 1845–49.
British Dictionary definitions for Polk
Polk
/pəʊk/
noun
1.
James Knox. 1795–1849, US statesman; 11th president of the US (1845–49). During his administration, Texas and territory now included in New Mexico, Colorado, Utah, Nevada, Arizona, Oregon, and California were added to the Union