Answer:
The Dawes Act of 1887 and the American Indian Citizenship Act of 1924 were laws imposed by the federal government that had the objective of acculturating the native populations, and assimilating them to the American culture, predominantly white and western.
Now, this law had negative effects for the United States: first, because it meant the loss of very great cultural values of the natives, which were lost to the detriment of Western cultural values imposed by the federal government; but also, because it was a forced assimilation of the natives, which implied the development of an inherent inequality between the natives and the whites, which led to a series of social conflicts that erupted in subsequent decades.