Native Americans have been the target of racial and ethnic abuses since Europeans arrived. In Indian Bureau boarding schools and schools provided on reservations, English was mandatory and children were severely punished if they spoke or wrote their native language, resulting in the gradual erosion of culture. This policy was an attempt at:.

Explanation:

The cultural assimilation of the natives included the assimilation  efforts by US change native American culture to European between 1790 and 1920. Henry Knox and George Washington were the first people to propose the transformation of native Americans. They also made a policy to civilise them.

Americanisation policies were based on the idea  that if the natives learned US values and customs then it would be easy for them to merge their traditions with American culture and join the mainstream society easily. The traditional religious ceremonies were banned after the Indian wars and Native American Boarding schools were established, the children were forcefully taught English and other subjects and compelled to leave their traditions and attend church.  

when studying cause and effect, historians usually group the causes into different categories. for example, cultural causes reflect how a society’s literature and art convey the way the society saw itself in relation to the rest of the world. another resource that historians use to understand society is pop culture, which tells them the trends and ideas that are preferred by the common people. when studying cause and effect, it’s important to remember multiple causation, or the idea that an effect could have several causes and vice versa.  

the correct option is “cultural causes” since art and literature are related to the culture of a place. culture is determined by literature, art, music.

the correct option is “pop culture” since it reflects the likes and ideas of common people whereas the rest of the options do not focus on common people.  

the correct option is “multiple causation” since it refers to the idea that events are caused by multiple reasons, not just a single one.