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The graph you presented is for global temperature, from 1880 to present.
Here, again, are the NOAA thermometer stations 1891-1920: ftp://ftp.ncdc.noaa.gov/pub/data/ghcn/daily/figures/station-counts-1891-1920-temp.png
Where does the data in your graph come from for the period of 1880-1920?
Of course it's global temperatures, that's what we're discussing here GLOBAL warming, not USA warming, do you know what Berkeley Earth does:
"Berkeley Earth is a source of reliable, independent, non-governmental, and unbiased scientific data and analysis of the highest quality. Our continued mission and responsibility is to deliver and communicate our findings to the broadest possible audience."
The data comes from weather stations on land and see and is independently analyzed. As far as I can see globally (which is what matters) the graphs for all agencies are a close match
Does this graph exist? USA1880-1999 in 1999 (NASA): Figure 6 https://pubs.giss.nasa.gov/docs/1999/1999_Hansen_ha03200f.pdf
When was it hotter in the USA. In 30s? In the 90s?
I will choose whatever the adjusted graph shows, tentatively of course, as is everything in science.
You can't predict the past when your head is full of communist wisdom. I told you I would prefer to discuss the science (what you see with your own eyes), and if you would use them, you would see that the data has been altered (and even imagined in the case of global temperature). But here we are, me discussing the communist historical revisionism right before your eyes and you inventing the past.
You've had many chances to discuss the science with many well educated individuals on this forum and you've shown that you don't understand the data set and analysis. Data adjustments have been made, they have been published and have stood through review for decades. The GLOBAL temperature averages done by different agencies using different averaging techniques, quality control procedures, homogenization techniques, and datasets match closely.