Final answer:
King John being forced to acknowledge the rights of his subjects in the Magna Carta in 1215 is a significant event in history as it limited the power of the monarch and established the principle of the ruler being subject to the law.
Step-by-step explanation:
One event that made 1215 a significant historical year was King John being forced to acknowledge the rights of his subjects in the Magna Carta. This document limited the power of the monarch and established the principle that the ruler is subject to the law. It was a foundational step towards constitutional government and the protection of individual rights.
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