President James Polk for his decision to invade Mexico for the benefit of United States.

Explain the motives of President James Polk for his decision to invade Mexico for the benefit of United States. Include explanations of and the roles of Manifest Destiny, the Battle of the Alamo, Zachary Taylor and Winfield Scott, international trade, your role as president, the cotton economy and the American western territories, American access to the west and western port cities, and other reasons. Then, give an overview of the dissent towards the war in the North, its leaders, and why ‘Mr. Polk’s War’ was protested as unconstitutional, nationally controversial, suspected of being fought for special slavery interests rather than the national interest, the role of the Southern 'slaveocracy', the potential extension of slavery, abuse of the limitations on presidential power, among other relevant reasons.