축약 문제입니다. 정규책의 Potlatch 관련 지문이었습니다.
In an effort to assimilate these indigenous populations into Western culture, where community practices that involve purging oneself of material goods are considered contrary to work ethic, both the United states and Canadian governments banned the potlatch practice in 1884.
(B) Potlach were outlawed in the 19th century by American and Canada in order to make the indigenous communities integrate into mainstream societies.
이게 정답인데요. 나머지 3개가 확실하게 오답이어서 문제는 쉽게 맞추었는데, 주어진 문장만 놓고 보았을때 저 두개의 나라를 mainstream society 라고 볼 수 있는 건가요? 흠 ..