Oh my God, you're worse than Oerdin. The only state with any trace of civil law left is Louisiana. Every other state is fully common law. Let me reiterate: It does not matter if a state was once a territory, or fully sovereign. Once they join the Union, all states are equal. It's only when they apply to join the Union that Congress can impose conditions on their application for statehood. Congress could deny admission to the Union because of the political beliefs of the constituency (as it often did balancing Free and Slave states prior to the Civil War), but once that state is in, it can't be ****ed with.