High Inbreeding
While the Amish don’t marry their cousins on purpose, there still is a high chance of inbreeding in their communities. Since their communities in Amish country as so small, they don’t have much choice when they have to marry another Amish person.
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No Recruits
Another interesting thing about the Amish is that they don’t believe in evangelism. They have a history of isolation from the modern world and shunning non-members. So it’s no surprise that the Amish don’t try to recruit. Even the most enthusiastic fans of the Amish can’t become members of the church.