John Fredrick Parker
Donor
In the Municipal Duma Elections of Moscow, before the insurrection, of the 710 members elected, 350 were Bolsheviks, 184 Kadets, 104 Socialist-Revolutionaries, thirty-one Mensheviks and forty-one other groups. Of the ~17,000 soldiers who vote in these elections, ~14,000 are Bolshevik supporters.
So... the Bolsheviks are popular in Moscow? Well fine, but the SRs still have more support in the countryside. And the Left SRs did work OTL with the Bolsheviks, until even they drew the line at Brest-Litovsk. Remember also that the Soviet delegation had already begun negotiations with the CP in November;* when Germany issues the ultimatum in February, Lenin isn't going to be there to split the Bolsheviks the socialists irrevocably over accepting it. ("We need both hands free to strangle the bourgeoisie" was his OTL rationale.)
Sure, Trotsky's "neither war nor peace" proposal will initially differ from Right SR war policies, but Operation Faustschlag will effectively force them into the same position. And remember, the key thing dividing the Left and Right SRs is the war. Only now the bulk of the Left SRs rejected the ultimatum passionately, so the factions (at least the rank and file) are likely to work more together; on top of that, a strong faction of Left Bolsheviks, under Bukharin, wanted to continue that war as a great European class struggle; and Trotsky, who here is the closest thing to an influential "dove", is much more likely to de facto agreeing with them as the Germans approach Petrograd (OTL it took a lot of pressure to get him to join Lenin in accepting BL, which here is now absent).
So no, absent Lenin, a conflict between the Bolsheviks and the other socialists is not inevitable. Do I even need to mention that the SRs didn't start trying to assassinate Bolsheviks until after their irrevocable split over Brest-Litovsk (which has already been noted as preventable TTL)?
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Ah, very informative, excellent post; much thanks. Would the CA necessarily "fall under its own weight" though, so much as simply ineffectively stumble along while the Soviet continued to rule Russia (at least for a time)? The Ukranian SRs as a faction is a very important note though, as even if the CA assumed full governance, the Right SRs could not hope to form a functioning coalition without the Bolsheviks.** AAR, as said, the German Ultimatum could do wonders for uniting these factions, so long as "conciliation" (like Kamenev and Zinoviev) and Left (like Bukharin) Bolsheviks are the key factions of said party.
*oh, and the CA doesn't even convene until January, so those negotiations should still go roughly as OTL
**even mathematically they could form a slim majority the Left SRs and the Mensheviks, I think we all know how well that would work out in reality