What event sparked the beginning of the Mexican War? ​

Mexico claimed the Nueces River as its northeastern border, while the U.S. claimed the Rio Grande River, and the day that both troops met at the Rio Grande and the Mexican army opened fire, on April 25, 1846, the Mexican American War began.

Explanation:

when Mexican troops cross north of the Rio Grande River and opened fire on U.S. troops at Fort Texas. Battle of Palo Alto

Explanation:

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in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".