Because the navajo languages are only spoken but never written.
To keep language on and on you need people to speak it, and people to remember it. However, from my memory, the number of navajo tribes arent much and the language is pretty hard to learn since it is only a spokent language, so there are no written records for it.
The Magna Carta exercised a strong influence both on the United States Constitution and on the constitutions of the various states. However, its influence was shaped by what eighteenth-century Americans believed Magna Carta to signify.
