Actually, by Universal Commercial Code contract, I CAN file a UCC contract as a "natural person" and have an affidavit printed and recorded with the courts that declares my independence as a "sovereign natural person". UCC Civil contracts are recognized in a court of law, and if they are not rebutted after publication and recording, they become true.
Be careful with this process...once you begin, you'll be grappling with various government agencies all of your life. Some battles you may win, others may set you back, but in the end, you are slowly becoming a "sovereign natural person of the state of <state>", and no longer a "citizen," "US citizen," etc, and SLOWLY REMOVING THE JURISDICTION of the Federal government from your life. They can make your life dificult if they want to, and the Patriot Act only gives them more ability to do just that.