Count the forces of the warring parties. The population of the Soviet Union according to the results of the 1939 census is 170 million. It should be borne in mind that the leaders of the 1937 census, who showed the result of «only» 162 million for «undercounting» of the population, were shot. In 1940, territories with a population of 18 million people were annexed to the USSR, though not always loyal to the new system, having a different mentality. We assume that the results of the «shot» population census are the only correct ones, then by 1941 the population of the colossal state was 180 million people.
The Third Reich, 1941, ie, Germany, Austria, the Sudetenland and some other territories inhabited by ethnic Germans subject to conscription – 90 million people. Hungary – 9.3 million (there were 800,000 Hungarians killed on the Eastern Front), Romania – 20 million (453,000 people died). These two countries are the unconditional allies of Germany, whose human reserves it could dispose of as its own. The contingent of volunteers in 64 thousand was allocated by 44 million Italy (during the war years the corps was renewed several times, 374 thousand were killed), and 25 million Spain – 18 thousand hours (irretrievable losses of 15 thousand). Slovakia – 36 thousand hours, 3 thousand people died, Croatia 2,200 people, the number of dead is unknown, Finland – about 300,000 people, losses of 70,000 (against 108,000 Soviet losses on this front, including 18,000 people killed in captivity)
Wehrmacht also owned resources, the industry of France, Norway, Belgium, Holland, Denmark, Poland, Greece, Bulgaria, Yugoslavia and the Czech Republic.
The only ally of the USSR was at that time a 47-million United Kingdom with 1.2 million (including parts located in the colonies), battered after the Dunkirk army. Her war with Germany until 1944 is similar to a ritual battle, a knight tournament, where, according to established rules, knights with knuckled gloves and all sorts of ammunition seize. England had 1500 aircraft, a dozen aircraft carriers, many cruisers, destroyers and submarines. After Dunkirk, the British did not have more than 100 tanks, but thanks to the developed industry, their number constantly increased. I fought here rather, the technique, not the people.