One language that was invented for this purpose is Esperanto.
They are apart of the same ethnic group.
They are a member of a culture, ethnic group, and/or nationality
The term is "ethnic group."
An ethnic is people who share a common background in ancestry, history, language, or culture, and who understand themselves to be members of a particular group.
An ethnic group is a group of people whose members identify with each other through a common heritage, consisting of a common culture, including a shared language or dialect.
An ethnic group is a group of people whose members identify with each other through a common heritage, consisting of a common culture, including a shared language or dialect.
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Ethnicity refers to a large group of people sharing common traits such as race, language, and religion.
They share a common culture.
A group of people who share the same ancestors, culture, language, or religion is commonly referred to as an ethnic group.
An ethnic group is a community or population that shares a common cultural background, heritage, language, or ancestry. Members of an ethnic group often identify with one another based on these shared characteristics and may have a distinct sense of belonging or identity.
The ethnic group in common with Eritrea and Somalia is the Beja people.