In 1831 Andrew Jackson enforced the indian removal act that forced all native americans to move west to present day oklahoma known as the tail of tears, they did fight for their land at first but they realized that they were outmatched with the enemy's weapons.
When they are forced to the west native americans are forced in other native americans territory leading to violence and competitions between the tribes.
When staying in the west they would stay away from the frontier so there would be no more situation relating violence.