People whose ancestors were born in the same region and who often share a language, culture, and religion are called a(n) group.

Ethnic Group

Explanation:

According to my research on different cultures, I can say that based on the information provided within the question this is called an Ethnic Group. Ethnic Groups are a group of people that identify with each other usually based on genealogy or ancestry, or maybe on on certain similarities such as culture, society, or dialect. Mexican, Indian, Asian are all examples of different types of Ethnic Groups.

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answer; is commonly believe to be "the" culture of a society;