So, it's the Norwegians. And all along, I thought it was the Amish!
The Amish population in the tri-state area is booming. They tend to have very large families. Although the Amish generally avoid politics and mixing with other ethnic groups, they are not averse to making money and using modern conveniences when it's to their benefit. They don't mind using your phone or taking a ride to town in your car. Look for an Amish candidate for governor or senator in Wisconsin when their numbers approach about ten million. Which by the rate they're reproducing should be in about twenty years.