Why were Navajos not allowed to speak their native language for many years starting in
the 1860s?

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.

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