The Amish originated in Switzerland as an offshoot of the Mennonite church. They came to North America in the 18th century to escape religious persecution. My apologies to the Amish if I don’t have this exactly right but that’s not the point. The point is this: The Amish are a Germanic people who, to this day, maintain a high fertility rate of 6.8. Each Amish woman has, on average, 6.8 children. A fertility rate of 2.1 is required to maintain a stable population. A fertility rate of 6.8 means population growth. Geometric growth. In 1920 there were about 5,000 Amish in North America. Today, in 2015, there are 300,000 Amish (!)
5,000 people grew into 300,000 people in 95 years.
In 2050 the Amish population is expected to pass 1,000,000. Geometric growth. Demographics is everything.