Polk refers to James K. Polk, the 11th President of the United States, who served from 1845 to 1849. He is known for his strong leadership during a period of significant territorial expansion, including the acquisition of Texas, California, and Oregon. Polk's presidency is often associated with the Mexican-American War, which resulted in the U.S. gaining vast lands in the West. In addition to his political legacy, "polk" can also refer to a genre of folk music known as polka. This lively dance music originated in Central Europe and became popular in the United States, especially among immigrant communities. Polka music is characterized by its upbeat tempo and is often played at celebrations and festivals.