Passage of the Dawes Act of 1887 affected Native American Indians by .. WHY?
1 - supporting their cultural traditions
2- attempting to assimilate them into mainstream American culture
3- forcing their removal from areas east of the Mississippi River
4- starting a series of Indian wars on the Great Plains
Passage of the Dawes Act of 1887 affected Native American Indians by "2- attempting to assimilate them into mainstream American culture," since this was part of a movement to "Americanize" the natives by stripping them of their culture and heritage.