To begin with, the League of Nations did have good intentions to begin with and to say that it was a complete failure would be egoistic in nature. The League had reduced much pain and sorrow after the events of World War I.
The Annexation of Texas, the Mexican-American War, and the Treaty of Guadalupe-Hidalgo, 1845â1848. During his tenure, U.S. President James K. Polk oversaw the greatest territorial expansion of the United States to date.
The U.S.-Mexican War(1846-1848): The Mexican-American War was the first major conflict driven by the idea of Manifest Destiny; the belief that America had a God-given right, or destiny, to expand the country's borders from 'sea to shining sea'.