Probably 40% of all Americans have some recent German ancestery. On my father's side I am rather typical, being German-Scots-Irish-English. There was heavy German immigration from 1700 to about 1900. In 1900 there were more German-speakers in San Antonio, TX, than either English- or Spanish-speakers. Many Germans colonies in Texas.
There are some places in the Texas Hill Country where German is still spoken at home. One barber shop in Fredericksburg (near the courthouse) you can hear German.