From the Halls of Montezuma

"As thefts, assaults, rapes, murders, and other crimes perpetrated by the volunteers mounted... ordinary Mexican citizens began to have serious reservations about the American invasion. ...particularly pro-expansionists such as Secretary of the Treasury Robert J. Walker, believed that Mexicans would welcome the Americans as liberators. Instead, public opinion turned against the Americans and began to create a climate for guerrilla bands to form in the area."

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