Answer :
I can compare their situation to a scenario wherein the house you've lived your entire life is being foreclosed and you have no other recourse but to become homeless and be subjected to the elements of nature.
The Native Americans first felt that they have no choice but to move from their land but they have a choice on where they will end up with. However, their escape is fraught with fighting and death against the US troops. Animals were treated better than they were at that time. And if they were not fighting against the US troops, they were battling against the forces of nature that is beyond their control. With no hope in sight, it is then decided to stop fighting and hope that those who lived will settle in a life that they are comfortable with.
The Native Americans first felt that they have no choice but to move from their land but they have a choice on where they will end up with. However, their escape is fraught with fighting and death against the US troops. Animals were treated better than they were at that time. And if they were not fighting against the US troops, they were battling against the forces of nature that is beyond their control. With no hope in sight, it is then decided to stop fighting and hope that those who lived will settle in a life that they are comfortable with.