The thermometer data for Texas shows a cooling trend, which USHCN has hidden. The way they did it was by progressively subtracting larger and larger amounts from older temperature data. The year 1920 had 1.8 degrees subtracted from the average value which the thermometers read.
This is a pattern which we have seen over and over again. Without the USHCN alterations to the temperature data, the US would show no warming.