A action that is part of a citizen's responsibility is to pay taxes and to for representatives.
No, it wasn't and it had nothing to do with being a new country.
Here the barons demanded that King John sign a document called the Magna Carta guaranteeing them certain rights. By signing the document, King John agreed to do his duty as King of England, upholding the law and running a fair government. In return, the barons agreed to stand down and surrender London.
The main complaint was that the Catholic Church sold indulgences. The extremely corrupt Catholic Church claimed that buying them would give you or a relative a free ticket out of Purgatory/Hell or at least lessen their sentence. Many people of the time disagreed with this because they believed that providence or actions alone determined your fate.