The Mexican American War resulted from Spain renouncing it's claim to Mexico and Mexico's subsequent open door policy on immigration. The growing American population eventually lead expansionist president James Polk to claim northern ...See moreThe Mexican American War resulted from Spain renouncing it's claim to Mexico and Mexico's subsequent open door policy on immigration. The growing American population eventually lead expansionist president James Polk to claim northern Mexico as United States territory. Written by
David Foss
See less