Mexico, angered over the annexation of Texas, attacked Texas settlers in what was by now a US State. As a result, Polk was able to persuade Congress to declare war. After a decisive victory, the United States gained 500,000 square miles of territory including Pacific regions that are now modern day San Diego and San Francisco.
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he two-year war (1846-48) was fought over the United States' annexation of Texas. The events that led up to the conflict began in 1837 when President Andrew Jackson (1767-1845) recognized Texas as independent (this was just after Texas had won its war with Mexico). Republic of Texas president Sam Houston (1793-1863) felt that protection against a Mexican invasion may be necessary, so he eyed annexation to the United States. In the meantime, Mexican president Antonio Lopez de Santa Anna (1794-1876) warned that such an action on the part of the United States would be "equivalent to a declaration of war against the Mexican Republic." In June 1844 the U.S. Senate rejected a proposed annexation treaty. But later that year Democratic Party nominee James K. Polk (1795-1849), an ardent expansionist, was elected president. Because the annexation of Texas had figured prominently in his campaign platform, outgoing President John Tyler (1790-1862) viewed Polk's victory as a public mandate for annexation, and he recommended that Congress pass a joint resolution to invite Texas into the union. Congress did so in February, and President Tyler signed the resolution on March 1, 1845, three days before leaving office.
BY: DULCE COS <3
The Mexican-American War was not unnecessary.
The Mexican War resulted in the Mexican Cession and the Treaty of Guadalupe Hidalgo ended the Mexican War.
The Mexican war bombed fort Sumter, which led to the begging of the Civil War!
I not sure but the Mexican war was prompted by the annexation of Texas. I hope this help!
The Mexican War (1846-48). Many men who were Civil War generals were junior officers in the Mexican War.