Between 1858 and 1861 a clash between conservatives and liberals led to a bloody civil war, a far graver threat than any foreign entity. In the end, the United States Senate rejected ratification of the treaty in 1860, deeming it too generous to Mexico. Had it been ratified, it would have given the United States major control over Mexican territory. History shows that in most cases Mexican diplomacy prioritized reasonable negotiations, not appeasement, to settle its disputes with the United States. Despite grievances, Mexico supported the United States struggles for freedom, starting with the American Civil War, and continuing with the two World Wars in the 20th century.

Source: New York Times July 17, 2019 19:00 UTC