The Establishment Clause says that "Congress shall make no law respecting the establishment of religion, nor prohibiting the free exercise thereof." Liberals interpret this as "Separation of church and state," while constitutional conservatives interpret this as meaning that there can be no official state religion. Regardless of how you interpret this, allowing Sharia Law within the U.S. would be incompatable with either interpretation. Some might say that states can make exceptions for Sharia Law, but that would reopen what once was: states can have official state religions or allow for recognition of particilar denominational beliefs, which was practiced at one...