In San Antonio, there were more German-speakers in 1900 than either Spanish-speakers or English-speakers. And, of course, there were clusters of German colonies all around the area. They extended all the way north toward the Red River and down south to the Rio Grande. A place named Pilot Point north of Dallas surprised me by having been founded by Germans. Of course, nearby by is Sanger. Many roads have German names.
The German character of these towns is mostly lost, of course. How German were they? In New Braunfels, a town near San Antonio, I got gas about forty years ago, and when he heard I was fromt East Texas, he reached out to be like a neighbor in a foreign country. He had been living there for several years and still was not used to the Germans. I told that even in German, strangers were not easily welcomed. Even today a man may marry a woman from another village and be thought of as a stranger after more than five years.
Well up to WWII, there was still background animosity between some German communities in Texas, and their English speaking neighbors, over the Civil War. Germans in Texas, as in Missouri, were largely pro-Union, and opposed to secession. Texas held a plebicite on the question of secession, and a number of Counties, often largely German, voted to remain in the Union.
The pro-Union residents of those counties, easily identifiable by looking at the vote returns, were looked on with suspicion by the (new) Confederate governemnt of Texas, and some communities were actually placed under martial law to curtail recruiting of troops for the Union.
The troops sent to perform those duties, not infrequently REMFS bent on proving to themselves that they were just as tough as the real combat troops off doing the fighting, behaved about like the Union occupation troops did in conquered Confederate communities, and caused the same lingering resentments.