We can actually deduce here that the "broken promises" Chef Joseph is referring to is the promise that was made in the 1855 treaty with U.S. that allowed the people of Chief to retain their traditional lands.
Who was Chief Joseph?
Chief Joseph was actually known to be a leader of the Wal-lam-wat-kain band of Nez Perce. Nez Perce was actually known to be a Native American tribe of the Pacific Northwest region of U.S. He was popularly known as Young Joseph.
The first treaty was actually signed with United States and Chief Joseph's father, Old Joseph. The United States signed another treaty which Chief Joseph didn't accept. The forced them out of the land.
Thus, all the good words and broken promises refer to what was written in the treaty.
Learn more about Chief Joseph on https://brainly.com/question/26342350
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