What foreign policies of President James Polk involving Texas California and the Oregon Territory were all efforts to?

President James Polk's foreign policies aimed at expanding U.S. territory, reflecting the belief in Manifest Destiny. His administration facilitated the annexation of Texas in 1845, which led to conflict with Mexico. Polk also successfully negotiated the Oregon Treaty of 1846, securing the Oregon Territory from Britain. Additionally, the Mexican-American War (1846-1848) resulted in the U.S. acquiring California and other southwestern territories, further fulfilling his expansionist goals.