As I recall, they kept the treaty by which Buck Watie and the "Ridge faction" received land in Oklahoma in return for the Cherokee land that the Ridge faction signed away.
That the Ridge faction had no authority doesn't mean that the US didn't keep its part of the bargain.
That is why traitors are held in such low esteem by honest men. They often create a great deal of trouble for honest men, though they line their own pockets pretty well.
i am reminded of the words of Red Cloud, of the Sioux nation:
"The hairy faces came among us & made us promises. More promises than there are leaves on trees, BUT of all the promises they made to us, they kept just ONE. They said they would take our LAND. They did.".
free dixie,sw