Answer: Harsh conditions on most reservations made hunting and farming for subsistence impossible, leading to conflicts over access to resources.
Step-by-step explanation:
There have been many sources of conflict between the U.S. Government and the American Indians in reservations such as the loss of land by American Indians due to the Bureau of Indian Affairs mismanaging lands belonging to reservations.
White settlers have also acquired land without just compensation and there have been militaristic persecution of American Indians by several groups.
Harsh conditions that led to conflicts over access to resources is not cause of conflict between the U.S. government and the American Indians.