Socialism, page-31

I see your point but they are not the same

The US constitution was written and has been in use all that time basically law and basically untouched
The Magna Carta is IMHO more like the ten commandants IE good rules to live by, but not used in it's entirety

Pope Innocent III replied favorably to King John's appeal. He condemned Magna Carta and declared it null and void. By September 1215, King John and his army were roving the countryside attacking the castles of individual barons,

So in original form it did not last the year