What important group did selim bring under ottoman control?

Sultan Selim brought a very important group the safavids. If you didn't know safavids were shia muslims and the ottoman empire (sultan selim) they were sunni muslims. Sultan Suleiman the Magnificent (sultan selims father) had a big rivalry with the safavids. Surprisingly his son Sultan Selim who was not expected to be a sultan after him became friends with the safavids. The safavids helped Sultan Selim kill his own brother şehzade bayezid and his children so he can be sultan. And that's how they became friends.

that was the type of government the spanish colonists were used to.