Europa Universalis 4: The Cossacks is an addition to the global strategy Europa Universalis 4. Events begin with the famous letter from the Cossacks to the Turkish Sultan. You will be able to grant the right to control your province to any local faction - priests, nobles or even Cossacks. You are required to keep an eye on the affairs of the province, because if it becomes too strong, it may rebel against your authority, and if you forget about it, it will begin to sabotage and pay less and less taxes.
To run the add-on, you must have the original game Europa Universalis 4.