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Binarism is the common but wrong idea that there are only two genders, expressed in a way that is a feature of colonialism and Western imperialism. This forces other cultures and people of color to conform within the white, Western gender binary system. Binarism is a form of sexism that erases ethnic nonbinary gender roles and identities.
The word "binarism" is commonly used to mean nonbinary erasure. While they are related and sometimes interchangeable, it is important to acknowledge that there is a distinction. Binarism refers to a societal and cultural mindset that enforces a gender binary. A mindset that has been spread and enforced through colonialism. This means that while it is far-reaching, it has particular effect on people of color who were forced to "assimilate to European binary gender roles."