Final answer:
The Missionary Era in Oregon was characterized by efforts to assimilate Native Americans into European-American culture, particularly through the use of boarding schools like the Carlisle Indian School.
Step-by-step explanation:
The Missionary Era in Oregon utilized a process of assimilation. During this time, clergymen, government officials, and social workers worked to integrate Native peoples into American life. Native American children were often removed from their homes to be placed in boarding schools, such as the Carlisle Indian School. These institutions enforced a Euro-American way of life, urging students to abandon indigenous languages, clothing, and customs. The broader context of the era included colonization of Indigenous lands, treaties that wrested away lands and rights, and systematic efforts to undermine tribal sovereignty and culture. Therefore, efforts in Oregon were primarily aimed at assimilating Native Americans into European-American society.