Beginning in the 1880s the group that do not work to assimilate Indians into American life is White settlers.
The assimilation of Indians into American life was how the people welcome and accept the Indians into their society, since we know that there is usually a difference in the culture of individuals especially the Indians, which make some of the American not to be able to flow well with the Indians such as the white settlers that do not assimilate them due to culture difference.
It should be noted that The Indigenous peoples of the Americas can be described as those inhabitants of the Americas that was there before arrival came European settlers in the 15th century hence Beginning in the 1880s the group that do not work to assimilate Indians into American life is White settlers.
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CHECK THE COMPLETE QUESTION :
Beginning in the 1880s all of the following EXCEPT worked to assimilate Indians into American life.
White settlers, Black America, the native America