Although the Magna Carta was signed in England on June 15, 1215, its anniversary became important to American political culture. Early U.S. leaders viewed it as a foundational document for liberty and rule of law. The ideas it contained influenced colonial charters and legal thinking. Americans invoked the Magna Carta during protests against British rule. Its legacy can be seen in due process and constitutional protections. The date serves as a reminder of the historical roots of American freedom.