What three things did American settlers have to do in order to purchase land in northern Mexico​

The four things that American settlers agreed to do in exchange for receiving land in Texas were to learn Spanish, become Mexican citizens, convert to Catholicism (the religion of Mexico), and obey Mexican law.

Explanation:

1. learn Spanish, 2. become Mexican citizens, 3. convert to Catholicism (and also obey Mexican Law

Explanation:

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".