How does federalism promote cooperation and at the same time promote tension between the national and state government?

Does the state of Alabama allow cohabitation or recognize common law marriage? You own a property that you smoke in now a bylaw was passed that you could no longer smoke in your own home can the grandfather clause be used legally in this situation? Can you be a bounty hunter if you are a convicted felon in new jersey? Why is the premeable of the constitution important? Why did most state constitutions include a bill of rights-? Did the Little Miami School Tax levy pass? How much time do you serve on a 3 year state sentence? How did the 16th 17th 18th and 19th amendment address progressive concerns? Guarantees a personal freedoms against possible threats from the government Are called? When would child photos be considered illegal? What is the Res Gestae Divi Augusti? Do I still owe if a creditor refuses to give you payment address? Is assault with a firearm considered a violent crime? Can you block your number when you send a text message? How does the court system protect and enchance individuals freedoms? What is legal status? What age a child stay over her boyfriends? Who survived the Whitman massacre? How long did martial law last in Washington under Lyndon B. Johnson in 1968? When do you have to identify yourself to police in Michigan?