The US wanted to force the Navajos and other Native American tribes to assimilate into American culture, so they tried to destroy their culture by making them not speak their language (until WWII, where they became the renowned Navajo Code Talkers)
Explanation:
It was technically genocide, since the US wanted to get rid of all Native American culture.
Checks and balances allows other form of governments or branches to check on other governments or branches to see if they are doing what they are supposed to do
