[skywhopper]

There's not one single way to end a war, and not all treaties are the result of war. Regardless, the US, and the colonies before the US existed, fought wars with many Indian tribes. But in most cases, either to end wars or to avoid them, treaties were made between the United States government and the various Indian tribes to define how the entities would deal with each other. Those treaties, like any international treaty, give obligations and responsibilities to both parties. If the tribe still exists, then the obligations still exist.