What was the outcome of Polk's expansionist policies in the Oregon trail?

Polk's expansionist policies led to the successful resolution of the Oregon boundary dispute with Britain, resulting in the Oregon Treaty of 1846, which established the 49th parallel as the border between the U.S. and British North America. This agreement allowed for the peaceful acquisition of the Oregon Territory, which was a significant achievement of Polk's presidency and fulfilled the Manifest Destiny ideology. The influx of settlers along the Oregon Trail during this period also contributed to the westward expansion of the United States.