Suppose you were a serf who wanted to get married while living under a feudal system. What would you need to do to get married
legally?

ill acquire marriage certificate which is sanctioned by the government,,ill also write on how my properties will be distributed to avoid future family fueds

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.