Mexican American period (1848-1856)

The Mexican–American War, also known as the Mexican War, the U.S.–Mexican War, the Invasion of Mexico, the U.S. Intervention, or the United States War Against Mexico, was an armed conflict between the United States and the Centralist Republic of Mexico from 1846 to 1848 in the wake of the 1845 U.S. annexation of Texas, which Mexico considered part of its territory despite the 1836 Texas Riot.
Through this time, supply ships from San Blas continued to be unpredictable and the missions—with their native workers—were worried to provide for the population. When the native groups began to resist the bigger demands, they were placed under firmer military control. Also, additional tribes were gathered, mixed, and combined into dense groups in order to serve the payment. Under these conditions, new diseases quickly spread and native cultures were further disrupted.
The continuing damage produced by the Apaches and the failure of the civil power to mount a determined response caused in the leaving of many smaller, distant settlements. Population became determined in central communities such as Tucson and Nogales. Moreover, continued civil unrest in central Mexico and the failure of the central government to establish effective running in the region resulted in the isolation of the southern Arizona population. Finally, these issues caused a shift in the economic connections of people living in the border, and they united with the expanding interests of the United States. With the opening of the Santa Fe Trail by Americans in 1821, the southwestern region became closer to the overland and sea directions that supplied communities along the Mississippi River as well as the western area of the United States. Although the southern Arizona area ...

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...negotiate. In 1846 alone, the position new hands four times, the war office six times and the finance office sixteen times. But, Mexican public opinion and all political groups agreed that selling the territories to the United States would ruin the national honor. Mexicans who similar direct conflict with the United States, including President José Joaquín de Herrera, were viewed as traitors. Military opponents of de Herrera supported by populist newspapers, considered Slidell's presence in Mexico City an insult. When de Herrera considered receiving Slidell to settle the problem of Texas annexation peacefully, he was accused of treason and removed. After a more nationalistic government under General Mariano Paredes y Arrillaga came to power, it publicly reaffirmed Mexico's claim to Texas; Slidell, convinced that Mexico should be "chastised", returned to the U.S.