Absolutely, that's a key correlation. As a result the Tsarist era land-lords did not need to be fought against: hence they could go Nationalist (and generally Socialist) without fear.I coulld even point to another interesting correlation - in all the White Regions - Siberia, South, Northern Russia due to historical reasons there was no institute of landlord landownership.
However, in the Russian/Ukranian/Belorussian portions there was no great separatist party to compete seriously with the Bolsheviks. That left them the party of the workers and peasants by default.
Russians were the majority in all those areas. In fact, if you look at the history of those minorities you will find that they were generally great supporters of the Whites.An also Volga region with a number of Turkish and Finnish nations, vast areas in Siberia, Transbaikal and Far East, Kalmykia, partly Crimea, Karelia and then there were German settlements in Volga region and New Russia and Jews scattered all along the western part of the Empire. That is if we take Ukrainians and Belorussians as Russian-speaking, which is not true from the modern point of view. I think you agree that the Soviet power encountered much more problems in Russian-speaking Cossack regions then in Tatarstan or Mordovia.
The Kalmycks went over lock, stock and barrel to the Whites.
The Bashkirs went White initially, but went Red after the Whites jerked them around.
The German colonists were solidly White, but large numbers were pacifist, so did not fight. Even then there were German colonist units in the White army (but not the Red). Stalin never forgave them, and their misery started well before the Nazi invasion.
I'll grant that the Jews were solidly Red. I'd forgotten about them.
The Caucasian mountaineers fought the Cossacks from time to time, true, but mainly fought for the Whites. Denikin had many Mountaineer divisions, whereas the Reds had basically none. After the end of the main RCW the Soviets crushed the Chechens, Ossetians and Dagestanis in campaigns of great bloodshed.
Actually, it survived in the Russian-dominated cities only. It's writ did not run much outside of that until after many years of battling the Basmachis.In Central Asia Soviet power surivived in almost complete isolation
You left out Armenia, Georgia and Azerbaijan, which were incorporated after the Civil War, and by external invasion.Then you thesis as I understood it was that all non-Russian regions were lost as a result of Revolution, in fact only the western regions (Poland in 1921 borders, Baltic States, Finland, Bessarabia) were. If you mean that large areas were temporary beyond the control of Moscow in 1918-21, then it was the case for territories with predominantly Russian-speaking population too.
That's a big "only" too. It was a sizeable portion of the former Russian Empire (I would guess a quarter by population). More importantly, it should have been the most solidly Bolshevik, because it had large industrial bases. It was also the most literate part of the empire.
My point is that language (and customary land laws, as you point out) is a good basis for determining the level of Bolshevik support. The number and educational level of working class people was a very poor basis. That is in complete contradiction to Marxist theory, and basically destroys the idea that the success of the Reds was because the working class united behind the Bolshevik revolution.
If another regime than the Bolshevik one presented a real alternative, then it was always taken. So much for popularity.