One point of controversy between the United States and Mexico in 1845──1846 included the

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The refusal of the Mexican government to receive Polk's envoy, John Slidell, was a major point of controversy between the two nations in 1845-1846. Polk had sent Slidell to Mexico City to negotiate the purchase of California and New Mexico, but Mexico refused to receive him, citing unresolved issues from the Mexican-American War. This led to increased tensions between the U.S. and Mexico and ultimately contributed to the outbreak of the war. The other options listed were not significant issues between the U.S. and Mexico during this time period.

One Point of Controversy Between the United States and Mexico