They do, They play a critical part in areas that the government cannot exclusively left to the government, also this allows people in different states to have a say in what goes on in their area, because all states have different laws and regulations.
To start slave farms since the land was bigger than most up state
The law helped unify the Muslim society because the law states that everyone on this earth is equal, and that behavior and how you treat others plays a huge role on how they unite. The Muslims pray together, break fast together, and work together. That is what made the Muslim society strong and held it from breaking apart. <span />