Respuesta :
Polk's administration was noteworthy for westward expansion (fulfilling the country’s Manifest Destiny), including negotiating for the Oregon Territory with Great Britain and the annexation of Texas which led to war with Mexico.
The answer is: Impacting Westward expansion-Oregon Territory/annexing Texas
James K. Polk was notoriously known for his enthusiasm in westward expansion. He widely promote the idea of annexation and gained support from many colonists. Due to the success of this plan, he even got the democratic nomination for presidential elections in mid 1940s.
