Explain how the war with mexico during the era of "manifest destiny" was a cause of the civil war

The white man did not like brown man so they fought.

Explanation:

white man is bad and racist during manifest destiny towards the west. The white man wanted the land for themselves.

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".

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