How did the arrival of european settlers change life for indigenous people on the plains? a. settlers killed nearly all the buffalo and most indigenous people were moved to reservations. b. the arrival of settlers had no impact on the lives of indigenous people in the plains region. c. settlers and the indigenous people of the plains shared ideas and ways of doing things, continuing to always occupy the same land. d. the settlers and native americans used horses to hunt buffalo more effectively and carefully managing the resources.