What factors enabled the Allies to defeat Nazi Germany by 1945?

The red Army learning from their own mistakes

the vast improvement, training for officers and men was design to encourage greater initiative and technology available was hastily modernized

Allowing the army to profit from the reform of operational practice.

Explanation:

The transformation in Soviet fighting power and morale has a number of explanations. In the first place the Red Army learned a great deal from German practice and from their own mistakes.

The air and tank armies were reorganized to mimic the German Panzer divisions and air fleets; communication and intelligence were vastly improved (helped by a huge supply of American and British telephone equipment and cable); training for officers and men was designed to encourage greater initiative; and the technology available was hastily modernized to match German.

Two other changes proved vital to allow the army to profit from the reform of operational practice. First, Soviet industry and workforce proved remarkable adaptable for a command economy long regarded as inherently inefficient and inflexible.

The pre-war experience of economic planning and mobilization helped the regime to run a war economy on an emergency basis, while the vast exodus of workers (an estimated 16 million) and factories (more than 2,500 major plants) from in front of the advancing Germans allowed the USSR to reconstruct its armaments economy in central and eastern Russia with great rapidity.

The second factor lay with politics. Until the summer of 1942 Stalin and the Party closely controlled the Red Army. Political commissars worked directly alongside senior officers and reported straight back to the Kremlin. Stalin came to realize that political control was a dead hand on the army and cut it back sharply in the autumn of 1942

answer placeholder because the system is messed up