Who mentioned that the Americans ordered the Navajos to stop raiding the slave traders instead of helping them?

The correct choice highlights a significant point in the historical context related to the treatment of the Navajo people. Ned's uncle's statement underscores the frustration and disillusionment faced by the Navajos during a period when they were struggling against external threats, such as slave traders, while also dealing with the complexities of their relationship with the American authorities.

This remark reflects a narrative where instead of receiving support to protect their community and interests, the Navajos were ordered to cease their own forms of self-defense. This illustrates a broader theme of betrayal and abandonment experienced by Native Americans in their interactions with the U.S. government, providing insight into the historical dynamics at play.

As for the other characters mentioned, their perspectives do not carry the same weight concerning this specific topic of governmental orders versus tribal self-defense against outside threats. This distinction helps to clarify the heightened importance of Ned's uncle's insights in this context.