What were the terms of Pinckney’s Treaty?

Explanation:

Spain and the United States also agreed to protect and defend the vessels of the other party anywhere in their jurisdictions and not to detain or embargo each other's citizens or vessels

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".