Use 'Mongol' to refer specifically to people originating from the nation of Mongolia. She's a Mongol, born and raised in Ulaanbaatar.
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Ethnic Identity
'Mongol' may also signify belonging to the ethnic group predominant in Mongolia. Traditional Mongol attire is colorful and ornate.
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Not a Derogatory Term
When referring to the people or nationality, 'Mongol' is respectful and not offensive. Mongol communities often celebrate Naadam festival with enthusiasm.