Magna Carta was originally created because of disagreements between Pope Innocent III, King John and his English barons about the rights of the King. The Magna Carta made the king denounced some of his rights , and made him realize he was not above the law. It also made him respect certain legal procedures , and realize his will was bound by law.
basically the magna carta was to secure the rights of the English aristocracy because they felt the king had usurped too much of their power. The magna carta actually went through quite a few different versions as kings would gradually ignore it then have to restate it at least in part to keep the nobility from revolting. It did secure some freedoms such as rights of widows and wards, but its main focus was on the barons and their rights to hold courts and to approve of things going on in the kingdom such as taxes before the king could levy them.
The magan Carta was the cornerstone for the future British Constitution. Many later attempts to draft constitutional forms of government, including the United States Constitution, trace their lineage back to the Magna Carta
A) The Magna Carta was written so that King John wouldn't take complete control over everyone. Citizens felt like King John was over-using his power, and decided that they needed to do something about it. The Magna Carta was made so that later Kings and Queens as well as current Royalties could not over-use their power. Thus, the Magna Carta was created.
b) One key argument was that King John was not using his power correctly. Popes, bishops, and barons thought that he was overusing his power. He also had many enemies in the Church, as well as in the Baron group. King John also placed heavy and unnecessary taxes upon the citizens, which made many people dislike him.
c) The Magna Carta had a huge effect on future rulers, because due to the Magna Carta, if future rulers wanted to over-use and abuse their power, they couldn't! Also, many constitutional forms of government were sparked by the Magna Carta. This basically just means that the Magna Carta gave them ideas to create new governments and laws.