Since the Protestat didnt have any priest, bishops or the clergy.
They would have a congregation, community of worshippers the made its own rules and elected it own leader.
Once people began to govern their churches, they also wanted political power.
Time passed and the congregations increased.They began to to affect other peoples lives, but it didnt replace the national government.
Finally the national rulers shared some power with the local government
...
Which is called FEDERALISM