"They carried with them, and carried forward, the great inheritance of the British Enlightenment—as well as the ideals which had an even deeper history in English common law and Magna Carta.
"These roots run deep, and they are still vital. Our Declaration of Rights of 1689 was not only the foundation of our constitutional monarchy, but also provided the source of so many of the principles reiterated, often verbatim, in the American Bill of Rights of 1791.
"And those roots go even further back in our history: the US Supreme Court Historical Society has calculated that Magna Carta is cited in at least 160 Supreme Court cases since 1789—not least as the foundation of the principle that executive power is subject to checks and balances.
"This is the reason why there stands a stone, by the River Thames at Runnymede where Magna Carta was signed in the year 1215. This stone records that an acre of that ancient and historic site was given to the United States of America by the people of the United Kingdom, to symbolize our shared resolve in support of liberty, and in memory of President John F. Kennedy."
—King Charles III, Address to Congress, April 29, 2026






