Wilson Shannon, Mexican War (American National Biography)

Graham Alexander Peck, "Shannon, Wilson," American National Biography Online, February 2000, http://www.anb.org/articles/04/04-00901.html.
In April 1844 [Wilson Shannon] resigned the [Ohio] governorship after President John Tyler nominated him as minister plenipotentiary to Mexico.

The Mexican government refused to recognize the independence of Texas and insisted that its annexation by the United States would constitute a declaration of war. Undeterred, Secretary of State John C. Calhoun armed Shannon with instructions denying Mexico's claim to Texas and later had Shannon warn the Mexicans against attempting to reconquer Texas. When the Mexican foreign minister charged the U.S. government with conspiratorially abetting Texas's treasonable revolt, Shannon demanded a retraction. After several bitter exchanges, Shannon precipitously suspended diplomatic relations. From November 1844 to May 1845, during which time Texas was annexed by a joint congressional resolution, the United States had no official communication with Mexico. President James K. Polk dismissed Shannon in March 1845 but could not rescind his tactlessness.
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