So here is a history update for you. Magna Carta wasn't the first document where a king's powers were constrained. Hammurabi's code, written three thousand years before Magna Carta, were the first.

But in the west, most of history was written in the 19th and early 20th centuries, during the colonial era. One of the fundamental principles was to underplay non western achievements. For example, most kids who graduate from a university in Canada cannot name an ancient Chinese, Egyptian, Mesopotamian or Indian scientist. They can name Greek scientists, authors, philosophers, etc. Either the other cultures produced nothing of value (can you name a single ancient Chinese or Indian classic?), or the western schooling system has chosen to ignore it. What do you think?