What did “assimilation through total immersion” mean for the students? american indians

The cultural assimilation of Native Americans was an assimilation effort by the United States to transform Native American culture to European–American culture between the years of 1790 and 1920. ... It established Native American boarding schools which children were required to attend.

Cultural assimilation is the process in which a minority group or culture comes to resemble those of a dominant group. ... Full assimilation occurs when members of a society become indistinguishable from those of the dominant group.

http://self.gutenberg.org/articles/eng/american_indian_boarding_schools

i believe the answer would be 1.