War With Mexico Provoke Disagreements Between The North And South
After these battles, Polk told the U.S. Congress that « the cup of indulgence was exhausted even before Mexico crossed the border of the United States, invaded our territory, and spilled American blood on American soil. » Two days later, on May 13, Congress declared war despite opposition from some northern lawmakers. There has never been an official declaration of war by Mexico. Mexico severed relations with the United States in March 1845, shortly after the annexation of Texas by the United States. In September, U.S. President James K. Polk sent John Slidell on a secret mission to Mexico City to negotiate the disputed Texas border, settle U.S. claims against Mexico, and buy New Mexico and California for up to $30 million. The Mexican Pres.
José Joaquín Herrera, who knew in advance of Slidell`s intention to dismember the country, refused to receive him. Even before the war was won and the territories were ceded, Congress was already discussing how to organize possible new territories gained in reparation from Mexico. .