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The war between Mexico and America has been labeled “an unprovoked and unjustifiable war of aggression and territorial aggrandizement.” The actions of the United States toward Mexico were of no such consequence. They were deliberately aimed at national security, and aiding Texas in its independence. Expressed in a letter from President James K. Polk to US Senator William H. Haywood, were the intentions of the US were strictly defensive. President Polk assured that all military and naval movements would not attack unless aggressed upon. It was noted that only if the Mexican Army crossed the Rio Grande and invade Texas would we drive them out