Additional *realistic* Lebensraum for various countries after 1800

And the Czechs had been dominated by Germans for quite a long time as well, as well as the Poles, not to mention the Hungarians in more recent time (along with others) Why would the Baltics prefer a foreign overlord when there are plenty of other nations whom have been busy overthrowing their former rulers and making an ethnic national homeland?

Were these Czechs and Poles treated as full and equal German/Austro-Hungarian citizens, though?

Also, it is worth noting that even if some or all of the Baltic peoples eventually rebel against German rule, German numerical, industrial, and technological superiority should be more than enough to crush any Baltic revolt(s). Indeed, Germany can even deport the Baltic troublemakers, agitators, and separatists to Poland, Ukraine, or the Caucasus afterwards. Indeed, didn't Joseph Stalin deport Western Ukrainian troublemakers, agitators, and separatists to Poland after the end of World War II in our TL?

The analogy to Alta California isn't nearly the same. The entirety of Alta California at the time of cession was about 85,000. It was claimed by Mexico, but there were very few residents there

Exactly how many people lived in New Mexico during this time, though?

and neither nation had the projection power.

What exactly do you mean by this, though?

And, even with that, there is still a large Mexican cultural influence on the southern border.

Yes; correct! However, if I remember correctly, the Hispanic population wasn't even 15% of the total population in any U.S. state other than New Mexico in 1940 (as in, 92 years after the Mexican Cession). Indeed, it was only after the end of World War II that the Hispanic percentage of the total population massively increased in many U.S. states, including in the former Mexican Cession.

In comparison, the Baltic states are in 1923 (from Populstat) home to about 3 million people. That's an population far larger in a land area far larger. That is not empty living space; that is occupied territory.

You are only talking about Latvia and Estonia here, correct? If so, then this data appears to be accurate. :) However, let's look at it this way--a sufficiently ambitious German government might be able to get 1 million ethnic Germans to immigrate from Russia to the Baltic states (with some bribing of Russia on Germany's part, obviously) along with getting 1 million additional ethnic Germans from Germany to immigrate to the Baltic states in the first 20 years of the Baltic states being under German rule. Afterwards, Germany might get an additional 250,000 ethnic Germans to immigrate to the Baltic states for every decade over the next 80 years (assuming that Germany would control the Baltic states for a total of 100+ years). Meanwhile, 100,000 Baltic people would move to and permanently settle in Germany proper every 10 years for the first 100 years of German rule in the Baltic states.

Thus, let's look at it this way:

1920 Population: Baltic peoples, 2.8 million; Germans, 0.2 million (the Baltic Germans).
1940 Population: Baltic peoples, 2.8 million (taking into account some natural growth, emigration to Russia, and migration to Germany); Germans, 2.2 million (due to migration from both Germany and Russia).
2020 Population: Baltic peoples, 2.0 million (due to natural population decline, continued emigration to Russia, and continued migration to Germany); Germans, 5.0 million (taking into account some natural growth in addition to continued migration from Germany and, to a much lesser extent, from Russia).

Now, I might be way too optimistic here. However, this appears to show that a sufficiently determined German government can probably successfully Germanize both Latvia and Estonia. :)

Now, the established policy for Germans in WW1 were to create friendly nations on their eastern border as a buffer against Russia. You could possibly have a different policy be applied on the Eastern Front by a complete change in German plans for a war, but that would eliminate much support for the invading Germans in the east.

False; after all, the population of both Latvia and Estonia are a very small percentage of Eastern Europe's total population. :) Indeed, I only want to turn both Latvia and Estonia into Germany's living space (Lebensraum). :)

And, if they're doing as much with the Baltics, they would probably go ahead and annex most of Poland and Lithuania while they're at it.

Actually, No--for demographic reasons. After all, Germany would certainly have enough of a challenge to Germanize both Latvia and Estonia to try Germanizing and annexing any other territories in Eastern Europe.

It really wouldn't be in Germany's interest to expand into that region when integrating Bohemia and Poland would be far more important to their interests.

Integrating both Bohemia and Poland is much harder for Germany to successfully do for demographic reasons, though. Plus, Germany can turn both Bohemia and Poland (as well as Lithuania) into friendly German allies and puppet states. :)

I do think that all of your points will occur, with immigration to the Baltics occurring, but it would only occur in large numbers from nations which are not in the German sphere.

Why exactly do you say that, though?

Then there would probably be some that would instead travel to the Kingdom of Ukraine or Hungary (German support would always come with protection for the ethnic Germans).

Why Hungary, though?

That's why I think that, at best, you'd get a sizable German minority that would eventually lead to a partition of the territory.

Actually, I'm not so sure about that. :)
 
Also, this map of Europe's population density in 1990 in our TL (though I don't think that this map looked too much different for Europe in 1920 in this TL) shows why exactly I consider both Latvia and Estonia to be such great living space for Germany in the event of a German victory in World War I :):

http://sedac.ciesin.columbia.edu/do...e-estimates-v3/place3-popdens-1990-europe.jpg

place3-popdens-1990-europe.jpg
 
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