is the term for the idea that people with the same ethnic origins

Ethnicity

Explanation:

Ethnicity is a term that describes shared cultural practices, values, and beliefs of by a group of people. This might include shared but not limited to language, religion, and traditions, among other commonalities. The term “ethnicity” can be said to be "the idea that of people with the same ethnic origins" according to the question.

yes                                            

explanation:

just cause                            

answer; migrate from a region;