The correct answer to this open question is the following.
Without a doubt, the effects of the act on Native American history over the course of the twentieth century left the Native Indians divided, hurt, and without their lands.
The Dawes General Allotment Act of 1887 was one of the major pieces of legislation in Native American history. The Act granted the power to the federal government of the United States to split the land and divide it into individual plots so people could get the land and make it work. If a Native American Indian wanted to be considered a United States citizen, it had to accept the Act.
This piece of legislation was another try to change the Indian's culture and habits, to destroy their traditions, and getting them to assume the white American culture.
This was another episode of the complicated and conflictive relationships between white colonists and Native American tribes, that started the moment colonists arrived in the Americas and founded colonies.
White people always wanted more land to settle in and exploit the resources for a big profit.
Native Indians always believed that the land belonged to them and had been inherited by their ancestors.