King John was a bad king, he was very unpopular, he was a king who abused his power by increasing taxes. He really angered the barons by increasing taxes.
Magna Carta 63 clauses promising...
The barons were very angry, they created an army to rebel and make the king sign the articles of the barons (Magna Carta)
In the 1215 the barons created a rebellion and forced the king to sin the Magna Carta, King John put his seal on the Magna Carta !!
King John put his real on the Magna Carta. King John placed himself under the rule of law and that was the first time in history, a ruler placed himself under the rule of law.
When the British settlers came to America they brought the idea of the Magna Carta with them,like the majority to rule and the rights to due process. When the colonists sat down to draft a constitution, they turned to the Magna Carta.