The concept behind lower authorities of law is that the local governments can quickly and more effectively deal with local issues than the state or federal government can; as the higher authorities of law take much longer to act on any issue (normally). This when combined with the fact that states are supposed to be sovereign in their own right, more so to deal with local matters; brings forth the necessity of state level laws.
You need to check your state's law, but not in any state I know of.
Of course you do. Most likely it is required by your state law but even if it is not a state law, you need the coverage in case you have an accident.
To become a lawyer, typically you need a Law degree. In most states to practice Law you also need to pass the State bar exam to prove you know the law in that state.
Depends on the law of your state. It is not required under Federal law
You do not need to be a citizen to practice law in the United States, except for the state of Louisiana. You do have to meet each state's requirements and pass the bar exam in the state you plan on practicing in.
No. You need to change state law or have a state constitutional amendment.
We would need to know what state you live in to tell you if you are considered common law married.
While not a US citizen, It is my understanding that where federal law has jurisdiction, it is supreme, state law would need to change to meet the federal requirements. Yes, the Federal Law trumps the state law.
Laws on this vary by state. Inquire with your state's DMV.
State Law
Because that's the law
It depends on state law, but probably yes.