Answer:
They blockaded them
Explanation:
To prevent help from France, the British had blocked ports to stop Maritime trade too.
In June 1215, King John was forced to submit to the demands of his rebel barons by agreeing to the settlement recorded in Magna Carta. This limitation of royal authority through a written grant was the barons' most radical achievement. It established the principle that the king was subject to and not above the law.
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Mongolia is the correct answer :)