A couple of additional observations concerning language and dialects.
I live in Lancaster, Pennsylvania, where the Amish and Old Order Mennonites all speak "Pennsylvania dutch," which is a dialect of German and Swiss with many archaic usages. They speak English as well, though at home the vast majority speak "dutch." My father's people came from southern Germany, and their dialect was known as schwabendeutsch. Classes in Pennsylvania dutch, for kids and adults, are offered in area public schools.
Some years back I visited the southwestern US, and I spect a couple of days in Chama, New Mexico. Hanging around the Cumbres & Toltec yard in the evening, one heard the locomotive hostlers chattering in Spanish, but some English words, like injector, lubricator and smokebox were heard as well. I was told that the Spanish they spoke was from the 16th century, when their ancestors first settled in the area, before the pilgrims made it to Massachusetts!