The Magna Carta influenced the United States Constitution and the Bill of Rights. The Magna Carta was written in England, in the year 1215 and guaranteed rights of the citizens. One of the causes of the Revolutionary War was that King George said the colonists did not have the rights that the Magna Carta held, even though they were British but living in the colonies, this they deemed unfair. The Magna Carta helped shape the United States Constitution, which guarantees rights of the citizens, and the Bill of Rights, which are the first 10 amendments in the Constitution.