The Soviet Union was founded after the Russian Civil War of 1922, when 16 equal Soviet Socialist Republics joined together to form the basis for the Union. I don't know why you are talking about the 1950's, as that is well beyond the era of the CCCP's formation.
One Soviet Marshall does not speak for the entire will of the Soviet people.
Of course the Soviets were desperate in seeking allied support during the war, it is not as if they were going to willingly sacrifice more soldiers than they needed to and they certainly could of used additional assistance. But regardless of this, the Germans still never would of been able to break past Leningrad, Moscow, or Stalingrad. These battles played out in a way that the German numbers were all but obsolete, if they decided to throw more troops into these ill fated endeavors it would of simply meant more prisoners for the Soviets to deal with. Environmental factors when combined with the brutality of this style of urban warfare would of crippled the German military either way. If anything, the German troops in the theater would only of been rendered more ineffectual if their numbers were inflated to greater heights, as they were already suffering from a sever lack of winter equipment and supplies.
oh, so you are serious.... really?
there are no historians, aside from the official now discredited Soviet historians, that agree with anything that you posted above regarding the 'voluntary' aspect of the Soviet Union.
As to the Germans not being able to win.. sure in 1941 they lacked the logistics and the preparation necessary. The big problem was not a shortage of winter equipment for the Wehrmacht, it was the huge difficulties in moving it forward to the troops in Russia while at the same time moving ammunition, spares, food, and reinforcements forward while trying to repair Soviet rail lines and roads at the same time. However, even then, Leningrad and Moscow are very near run things for the Soviets and Stalingrad also with could have been a German victory with only a few changes to the variables.
Even halted however, the Germans still controlled huge chunks of the most valuable agricultural and industrial territory of the Soviet Union and had to be pushed out after Kursk. Which the Soviets admit they could not do without outside help.
As to equal Republics? Just how equal, really, were the Central Asians (who were routinely called disparging names by the Russians) or the Ukranians (deliberately starved by the millions by Stalin) or the Volga Germans (deported to Siberia by force in 1942), Crimean Tartars (deported by force to Siberia post 1944), or the Balts (forceably annexed, subject to gratitous and fierce purges,executions and deportation BOTH times when occupied by Soviet forces).