Amish (people)

The Amish. An ethnoreligious group with 500,000 members, mostly in North America.

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Ethnoreligious Group. A grouping of people, usually closed, who are unified by a common religious and ethnic background. The term ethno-religious group, along with ethno-regional and ethno-linguistic groups, is a sub-category of ethnicity and is used as evidence of belief in a common culture and ancestry. In a narrower sense, they refer to groups whose religious and ethnic traditions are historically linked.

Characteristics
The elements that are defined as characteristics of an ethnoreligious group are “social character, historical experience, and theological beliefs.” A closing of the community takes place through a strict endogamy, which is specifically for the community and that distinguishes an ethno-religious community, that is, as distinct from any other group.

Endogamy is the cultural practice of mating within a specific social group, religious denomination, caste, or ethnic group, rejecting any from outside of the group or belief structure as unsuitable for marriage or other close personal relationships.