The historical document signed to establish a more democratic government in England was the Magna Carta in 1215. This charter, which King John was compelled to sign, limited the powers of the monarchy and laid the groundwork for the rule of law and due process. It established the principle that the king was subject to the law, not above it, which was revolutionary at the time. The Magna Carta influenced the development of constitutional governance and inspired future democratic principles, including individual rights and liberties, impacting subsequent legal frameworks, such as the United States Constitution and the Bill of Rights.