Which of the u. s advantages contributed the most of their victory in the mexican American war?​

Mexican-American War, war between the U.S. and Mexico from 1846 to 1848. consistently victorious—resulted in the United States' acquisition of more than 500,000Was there opposition to the Mexican-American War within the United States? Poor sanitation contributed to the spread of illness, with volunteers

Explanation:

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers

"the royal proclamation of 1763"