Answer:
The idea of territorial exapnsion and "manifest destiny" brought the U.S. into armed conflict with Mexico in 1846.
Explanation:
The British idea of "Manifest Destiny", which stated that they had the divine power and authority to expand their territories, caused many conflicts and wars. One of these was the Mexican-American War of 1846. The newly elected U.S. president James Polk (1945) promoted the acquisiton and annexation of Texas to expand their territory. This area was Mexican territory, although is was not formally recognized by the Mexican government. Therefore, when they decided to attack U.S. soldiers that were sent there, Polk and Congress declared war. The Mexican had to surrender and sign the Treaty of Guadalupe Hidalgo in 1848.
