This was achieved with the lend-lease agreement with the US. This was designed to supply the Soviet Union with resources to help produce machinery and improve communication links as the distance between the Russian cities and businesses became stretched. The supplies were imported using the Black Sea remaining a safe distance from German attack. As a result, the Soviet Union were able to out produce Germany. The Russians become more efficient creating tanks, ensuring they were all the same would mean fixing them would become easier and the time it would take to produce shortened.
The USA’s involvement in World War 2 was due to the Japanese bombing of pearl harbour , although Germany were not obliged to go to war with the Japanese as they had not been declared war by the Americans, Hitler decided to give assistance. This only meant a larger power became a German enemy.
A major mistake made by the Germans was the underestimation of Soviet force, once the initial advancements were made in Operation Barbarossa. Hitler and the wider population believed that it would only be time before the Soviets would have to succumb to defeat. One German general believed that Soviet military leaders were ‘less of a threat than the tsarist Russian generals’. However this was not the only power that misjudged the strength of USSR as American generals also expressed that the Soviets would only last within a timescale of a single month to 3 months. Another mistake made by Hitler