The main spark for the outbreak of the Mexican-American War in 1845 was the United States' acceptance of the new state of

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The acceptance of Texas as a state in the United States in 1845 was the main trigger for the outbreak of the Mexican-American War. Texas had previously been a part of Mexico, and its annexation by the United States was seen as an act of aggression by Mexico.

The Main Spark for the Outbreak of the Mexican-American War