There are many people who speak Pennsylvania Dutch but know very little about where it came from or how it came about. If that’s you, it’s great that you’re here! Pennsylvania Dutch is a German language because it comes from a mixture of German dialects. The most important and influential one is called Pfälzisch in German or Palatine German in English. It is spoken in the southwest of modern Germany in a region called the Rhineland-Palatinate. Many of the ancestors of modern Anabaptists (like the Amish and Mennonites) were Swiss but because of persecution in Switzerland they moved into the Rhineland-Palatinate region of what is now Germany for about two generations before continuing on to Pennsylvania. During that short time, they switched from Swiss German to Palatine German. This is why Pennsylvania Dutch is most similar to Palatine German dialects. Speakers of Pennsylvania Dutch will probably have an easier time understanding someone who speaks Palatine German (or dialects spoken in other places in southern Germany) compared to someone who speaks modern Standard German.
Many people wonder why you would call the language and people Pennsylvania Dutch if they speak German and not Netherlandic Dutch. The answer Mark Louden gives in his (2016) book Pennsylvania Dutch: The Story of an American Language (pg. X) is that in the 1700s when the immigrants who became the Pennsylvania Dutch landed in Pennsylvania and before the Netherlands and Germany existed as we know them today, everyone who came from the Dutch- and German-speaking parts of Europe were referred to in English as Dutch. This name is the one that stuck. People who speak the language still use Dutch (or sometimes Amish) to talk about the language in English. They do not call it German so neither do we.
It’s interesting to note that even though nowadays most Pennsylvania Dutch speakers are Amish, this was not always the case. The vast majority of Pennsylvania Dutch speakers (around 95% of the original immigrant group!) belonged to non-Anabaptist groups like the Lutheran and German Reformed churches and they lived mostly in Pennsylvania. In fact, 200-300 years ago much of the backwoods of Pennsylvania used to be German/Pennsylvania Dutch-speaking and many regular people living there did not even speak English. Like with so many other immigrant languages, Pennsylvania Dutch was gradually displaced by English. That is why it is now primarily the Old Order Mennonites and the Amish, who strictly separate themselves from mainstream society, that make up the majority of Pennsylvania Dutch speakers.
All of this information and much more can be found in Mark Louden’s excellent book Pennsylvania Dutch: The Story of an American Language.
