Can anyone point out a treaty the US hasn't broken with the Native Americans?

“They made us many promises, more than I can remember, but they never kept but one; they promised to take our land, and they took it.”

Red Cloud (1822 – 1909)

I spent the latter half of my undergrad interested American Indian issues and did several projects and papers on them. For the life of me, I can’t remember any, but I seem to think there are a scant few. Minor issues, really.

The treaty Lewis and Clark made with the Blackfoot tribe. They basically declared war on them because they would not trade with the Expedition.

It’s difficult to answer, because whether a treaty is broken or not depends on who’s asking, and how the original treaty was written. There have been hundreds of treaties with Native Americans over the past 500 years or so since the European Invasion, dealing with land rights, hunting and fishing rights, and, more recently, gaming rights. Many have ended up in courts with various outcomes.