Why did the Spanish give Native Americans the most dangerous jobs (such as mining gold and silver)?

the spanish gave them jobs because they new the land more than the spanish people did

Explanation:

ye

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".