The spark of the mexican-american war was when .A. General Taylor attacked Mexico CityB. General Scott's troops fired the first shotsC. General Kearny attacked Santa Fe D. General Taylor's troops crossed into "Mexican territory"

D. General Taylor's troops crossed into "Mexican territory"

Explanation: The Mexican-American War sparked when General Zachary Taylor's troops arrived at the Rio Grande River, an action that Mexico considered an invasion of their territory.

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d is the best answer for this question.